Trackable smartwatch and methods to locate it

Abstract

Locatable smartwatch and methods for locating it The invention relates to a locatable smartwatch and methods for locating the watch. The watch comprises a strap 1 for attaching the watch to a user's wrist, a screen 3 for displaying time information, a case 2 attached to the strap 1 and containing an electronic circuit 5 and an electrical energy storage means 4. The electronic circuit 5 comprises an antenna and is configured to transmit an electromagnetic signal representing identification information of the watch. At least a portion of the case 2 covering the antenna is made of a material transparent to the electromagnetic signal. Figure 1

Description

Title of the invention: Localizable connected watch and methods for locating it Technical field

[0001] The present invention relates to a connected watch, and methods for locating said watch. Prior art

[0002] Smartwatches are devices known for telling a user the time. Smartwatches can also have various features that allow a user to make calls, check emails, or browse the internet. Smartwatches are also called "smart watches." Such a watch is usually equipped with a screen to display information to a user.

[0003] There is a need for ways to easily find a smartwatch when it is lost. Statement of the invention

[0004] An object of the present invention is to provide means for easily finding a connected watch when it is lost.

[0005] To this end, the invention proposes a connected watch comprising: • a strap for attaching the watch to a user's wrist, • a screen to display time information, • a case attached to the bracelet and containing: • a means of storing electrical energy, • an electronic circuit powered by the electrical energy storage means.

[0006] The electronic circuit of the watch comprises an antenna and is configured to transmit an electromagnetic signal representing identification information of the watch. At least a portion of the housing covering the antenna is transparent to the electromagnetic signal.

[0007] Thanks to the electronic circuit and the antenna, as well as the portion of the case transparent to the electromagnetic signal, the watch can emit a signal allowing its presence to be detected and therefore located.

[0008] The watch according to the invention comprises a screen such as a liquid crystal or amoled screen, for displaying data to a user. The screen displays at least one time information, such as the time in digital format by displaying numbers on the screen or in analog format by displaying hands on the screen. The screen forms part of the external surface of the watch, just like the case.

[0009] The watch includes a strap to be attached to the wrist of an adult or a child. It is therefore a wristwatch.

[0010] The electrical energy storage means comprises at least one battery or an electric cell such as a button cell. The electrical energy storage means is preferably a rechargeable battery. The electrical energy storage means is configured to supply electrical energy to the electronic circuit comprising the antenna. The energy stored in the electrical energy storage means makes it possible to provide the energy necessary for the electronic circuit and the antenna to transmit the electromagnetic signal, which includes generating and transmitting the electromagnetic signal.

[0011] Preferably, the electrical energy storage means is further configured to supply electrical energy to the screen and / or other possible internal electronic circuits (preferably all such circuits) of the watch, for example a microcomputer of the watch. Thus, advantageously, the electronic circuit comprising the antenna is directly connected to the primary energy source of the watch, which makes it possible to obtain an efficient and compact watch, without providing an additional volume for this electronic circuit and a separate energy source. The watch extends for example over a surface area of 37 mm or less by 42 mm or less, and over a height of 11 mm or less, this defining limited dimensions for a connected watch comprising so many technologies.

[0012] The portion of the housing covering the antenna may be made of one or more materials transparent to the electromagnetic signal.

[0013] For example, the portion of the watch case is made of one or more materials transparent to UHF (ultra high frequency) electromagnetic waves. Alternatively or concomitantly, the portion of the case is made of one or more materials transparent to VHF (very high frequency) and / or SHF (super high frequency) waves.

[0014] Preferably, an entirety of the watch case is transparent to UHF (ultra high frequency) electromagnetic waves. Alternatively or concomitantly, the entirety of the case is transparent to VHF (very high frequency) and / or SHF (super high frequency) waves.

[0015] The housing contains the electronic circuit and the antenna. Preferably, the housing is hermetic, for example watertight and airtight.

[0016] In the context of this document, electromagnetic waves are designated according to the international standardization carried out by the International Telecommunications Union.

[0017] VHF waves or metric waves have a frequency between 30 MHz and 300 MHz.

[0018] UHF waves or decimetric waves have a frequency between 300 MHz and 3 GHz.

[0019] SHF waves or centimeter waves have a frequency between 3 GHz and 30 GHz.

[0020] The case may include the screen of the watch. In this case, the screen is part of the case. For example, the portion of the case described above includes a portion of the screen or is included in the screen. For example, the case is closed by the screen of the watch.

[0021] The electronic circuit and the antenna of the watch are configured to generate and transmit the electromagnetic signal such that the electromagnetic signal is detectable by a first device distinct from the watch. Preferably, the electromagnetic circuit and the antenna are configured to transmit the electromagnetic signal such that the electromagnetic signal is detectable by the first device at a distance traveled in the air of at least 10m, preferably at least 25m. This means that the electromagnetic signal is detectable by the first device when the watch is positioned within a radius of 10m, preferably 25m, relative to the first device, and no obstacle other than air separates the first device from the watch. The first device being configured to receive the electromagnetic signal, it makes it possible to detect the presence of the watch. For example, the first device is a smartphone.

[0022] In a preferred embodiment of the invention, the electronic circuit comprising the antenna of the watch is configured to emit the ultra high frequency (UHF) electromagnetic signal, preferably at a frequency between 2400 and 2483.5 MHz. This allows communication using the Bluetooth standard. Bluetooth technology has the advantage of allowing communications over short distances and with high energy efficiency between the watch and the first device.

[0023] In a preferred embodiment of the invention, possibly combinable with that of the preceding paragraph, the electronic circuit is configured to emit the ultra-wideband (UWB) electromagnetic signal, and preferably at frequencies between 3100 and 10600 MHz, preferably between 6000 and 8500 MHz. The use of ultra-wideband signals allows very precise localization of the watch by the first device when a short distance separates the watch from the first device.

[0024] Preferably, at least one face of the antenna is oriented towards the portion of the housing covering the antenna and is not separated from the housing by an electromagnetic shielding part capable of attenuating the electromagnetic signal. This avoids attenuation of the electromagnetic signal by the housing and therefore improves the energy efficiency of the watch for emitting a signal at a given power.

[0025] Preferably, at least one face of the antenna directly faces the housing. This means that the at least one face of the antenna is oriented towards the portion of the housing. For example, the at least one face of the antenna directly faces the portion of the housing covering the antenna and which is transparent to the electromagnetic signal. Preferably, there is no part separating the face of the antenna from said portion of the housing. This improves the efficiency of the emission of the electromagnetic signal by the antenna.

[0026] Preferably, the watch case includes an electronic circuit on / off button for starting or stopping the transmission of the electromagnetic signal by the electronic circuit. This saves energy by turning off the electronic circuit when the watch is not in use or is not at risk of being lost.

[0027] In the context of this document, the transmission of the electromagnetic signal comprises the generation and transmission of the electromagnetic signal. The electromagnetic signal is generated by the electronic circuit and transmitted by the antenna.

[0028] The button is configured to be pressed by a user. In response to successive presses of the button by a user, the electronic circuit is configured to transmit or stop transmitting, successively, the electromagnetic signal.

[0029] Preferably, the watch case is made of a polymer transparent to the electromagnetic wave, such as plastic. In one example, the watch case is entirely transparent to the electromagnetic wave and / or entirely made of polymer.

[0030] Preferably, the housing is made of an electrically insulating material.

[0031] The antenna may have a planar shape, that is to say it has a shape flat. In other words, it is contained in a plane or flattened.

[0032] Preferably, the watch according to the invention also comprises a microcomputer configured to display information on the screen of the watch. For example, this information is weather information, telephone contact information, number to call in case of emergency, battery charging status, calendar, or music played by the watch. Preferably, the watch is configured to allow interaction between the user and the watch, so that the user can navigate through menus or play games on the watch, for example.

[0033] Preferably, the watch according to the invention is further provided with means for communicating via a mobile telephone network and / or via Wi-Fi. This makes it possible in particular to download data from the Internet onto the watch. Preferably, the microcomputer of the watch is configured to receive this data.

[0034] The present invention also provides methods for locating a watch according to the invention. Preferably, these methods are computer implemented.

[0035] In a first embodiment of a method according to the invention, the method comprises: • wireless transmission of an electromagnetic signal representing identification information of the watch by an electronic circuit located in the watch and comprising an antenna, • reception of the electromagnetic signal by a first device separate from the watch, • in response to the reception of the electromagnetic signal by the first device, and by means of the first device: determination of a relative position of the watch with respect to the first device and display of the relative position of the watch on a screen of the first device.

[0036] For example, the first device is a smartphone.

[0037] Preferably, the electromagnetic signal emitted by the antenna is ultra-wideband (UWB), and preferably at frequencies between 3100 and 10600 MHz, preferably between 6000 and 8500 MHz, preferably between 6500 and 8000 MHz. This allows precise location of the watch.

[0038] In the methods according to the invention, the determination of the position of the watch by the first device and the display of the position of the watch determined by the first device are carried out in response to the reception of the electromagnetic signal by the first device. The electromagnetic signal received by the first device comprises the identification information of the wristwatch.

[0039] In a second embodiment of a method according to the invention, the method comprises: • wireless transmission of an electromagnetic signal representing identification information of the watch by an electronic circuit located in the watch and comprising an antenna, • reception of the electromagnetic signal by a first device separate from the watch, • in response to the reception of the electromagnetic signal by the first device, and by means of the first device: determining a position of the first device and transmitting to a second device a second signal representing the watch identification information and the position of the first device, • receiving the second signal by the second device and displaying the position of the first device on a screen of the second device.

[0040] The second device is distinct from the watch and the at least one first device. For example, the second device is a smartphone. For example, the second device belongs to an owner of the watch.

[0041] For example, the determination of the position of the first device is carried out by means of a geolocation circuit of the first device.

[0042] The transmission, by the first device, of the second signal to the second device can be carried out via a wireless communication network, and possibly via a server.

[0043] The second signal is preferably electromagnetic.

[0044] This method has the advantage of working even when the first device cannot precisely determine the position of the watch, which can occur when the watch is too far from the first device. For example, this is the case when the watch is at a distance from the first device which is greater than the maximum transmission range of the ultra-wideband electromagnetic signal. In this case, the watch can be configured to transmit the electromagnetic signal according to the Bluetooth standard to the first device. This results in less precise location of the watch, but which can be achieved when the first device is at a greater distance from the watch.

[0045] The first device then detects the presence of the watch within a certain perimeter around the first device, but without being able to precisely determine its relative position with respect to the first device. Then, the first device sends its own location to a second device, which provides an approximation of the position of the watch to the second device.

[0046] Preferably, the electromagnetic signal is received at the same time or at different times by several first devices distinct from the watch. In this way, it is possible to use a large number of first devices to locate the watch, even when it is moved. For example, the first devices are smartphones, carried by users distinct from the users of the watch and the second device, and connected to the second device for example via a telecommunications network and a server.

[0047] The second device is configured to receive the second signal representing the identification information of the watch and the position of the first device. The second signal is preferably wireless. Based on the second signal, the second device is configured to display the position of the first device which is an approximate position of the watch.

[0048] This allows a user of the second device to benefit from the proximity between the first devices and the watch to find the watch, the first devices being for example worn by different people. It is then not necessary for the user of the second device to be close to the watch to detect it, nor to enter into contact with users of the first devices to locate the watch.

[0049] For example, the first device is a smartphone. Preferably, the electromagnetic signal is received by several first devices. In this case, the position of the watch can be determined by triangulation, for example, which is more accurate.

[0050] Preferably, the second signal is transmitted to the second device via a server comprising a database matching the identification information of the watch and identification information of the second device. In this case, the method comprises: • in response to the reception of the second signal by the server, and by means of the server: determination of the second device on the basis of the identification information of the watch and the database, • transmission by the server of the watch identification information and the position of the first device to the second device determined by the server.

[0051] The signal transmitted by the server may be the second signal, possibly modified, or another signal representing the identification information of the watch as well as the position of the first device.

[0052] The electromagnetic signal emitted by the antenna is preferably ultra high frequency (UHF), preferably at a frequency between 2400 and 2483.5 MHz.

[0053] In a third embodiment of a method according to the invention, the method comprises: • wireless transmission of an electromagnetic signal representing identification information of the watch by an antenna located in a case of the watch, • reception of the electromagnetic signal by a first device separate from the watch, • in response to the reception of the electromagnetic signal by the first device, and by means of the first device: determination of a position of the watch and transmission to a second device of a second signal representing the watch identification information as well as the determined watch position, • reception of the second signal by the second device and display of the position of the watch on a screen of the second device.

[0054] Determining a position of the watch by the first device may include determining a relative position of the watch with respect to the first device combined with determining a position of the first device.

[0055] The second device is distinct from the watch and the at least one first device. For example, the second device is a smartphone. For example, the second device belongs to an owner of the watch.

[0056] In one example, the second device is configured to allow a display of the position of the watch by the second device while the first device is configured to prevent a display of the position of the watch by the first device. This avoids providing the position of the watch to users of the first devices if they are not the owners of the watch or are not authorized to have access to the location of the watch.

[0057] For example, the determination of the position of the first device is carried out by means of a geolocation circuit of the first device.

[0058] The wireless transmission of the second signal to the second device may be wireless, for example via a wireless communication network possibly comprising a server. Optionally, the server is configured to determine the position of the watch based on the relative position of the watch with respect to the first device and the position of the first device.

[0059] Preferably, the method is performed using several first devices. Optionally, the server is configured to determine the position of the watch based on relative positions of the watch with respect to the first devices and the position of the first devices. The use of several first devices makes it possible to determine the position of the watch more precisely.

[0060] The method has the advantage of allowing precise localization of the watch. In the method, the watch can be configured to transmit the ultra-wideband electromagnetic signal to the first device. Preferably, the electromagnetic signal emitted by the electronic circuit is ultra-wideband (UWB), and preferably at frequencies between 3100 and 10600 MHz, preferably between 6000 and 8500 MHz.

[0061] The first device determines the relative position of the watch with respect to the first device. The first device also determines the position of the first device, for example by geolocation. Based on the position of the first device and the relative position of the watch thus determined, it is possible to determine the position of the watch. This determination of the position of the watch based on the position of the first device and the relative position of the watch can be done by the first device, by the second device, or by a separate server.

[0062] Based on the position of the first device and the relative position of the watch thus determined, the first device generates and transmits the second signal to the second device.

[0063] The second signal is preferably electromagnetic.

[0064] The second device then displays the position of the watch, allowing a user of the second device to locate the watch.

[0065] Preferably, the electromagnetic signal is received at the same time or at different times by several distinct first devices of the watch. In this way, it is possible to use a large number of first devices to locate the watch, even when it is moved. For example, the devices are smartphones, possibly carried by users distinct from the users of the watch and the second device, and connected to the second device.

[0066] The second device is configured to receive the second signal transmitted by the at least one first device. The second signal therefore comprises the identification information of the watch and the position of the watch. Based on the second signal, the second device is configured to display the position of the watch.

[0067] This allows a user of the second device to benefit from the proximity between the first devices and the watch to find the watch, the first devices being for example worn by different people. It is then not necessary for the user of the second device to be close to the watch to detect it, nor to enter into contact with users of the first devices to locate the watch.

[0068] For example, the first device is a smartphone. Preferably, the electromagnetic signal is received by a plurality of first devices that, in response to receiving the electromagnetic signal, each determine a position of the watch and each transmit a respective second signal representing the identification information of the watch as well as the position of the watch. In this case, the transmission is preferably performed via a server that receives all the second signals, determines the position of the watch based on the second signals, and transmits the position and the identification information of the watch to the second device.

[0069] Preferably, the second signal is transmitted to the second device via a server comprising a database matching the identification information of the watch and identification information of the second device. In this case, the method comprises: • in response to the reception of the second signal by the server, and by means of the server: determination of the second device on the basis of the identification information of the watch and the database, • transmission by the server of the watch identification information and the watch position to the second device determined by the server.

[0070] The signal transmitted by the server may be the second signal, possibly modified, or another signal representing the identification information of the watch as well as the position of the watch.

[0071] As used herein, the terms 'locate' and 'location' are used interchangeably with the terms 'determine a position' and 'position'.

[0072] In the context of this document, position information of a device such as the watch or the first device may for example comprise geographic coordinates of the device.

[0073] The use, in this document, of the verb "to understand", its variants, as well as its conjugations, cannot in any way exclude the presence of elements other than those mentioned. The use, in this document, of the indefinite article "un", "une", or of the definite article "le", "la" or "1'", to introduce an element does not exclude the presence of a plurality of these elements.

[0074] All of the preferred embodiments, characteristics, as well as all of the advantages of the embodiments of the method according to the invention are transposed mutatis mutandis to the other embodiments of the method according to the invention and vice versa.

[0075] All of the preferred embodiments, characteristics, as well as all of the advantages of the watch according to the invention are transposed mutatis mutandis to the methods according to the invention and vice versa. Brief description of the figures

[0076] Other characteristics and advantages of the present invention will appear on reading the detailed description which follows, for the understanding of which reference will be made to the attached [Fig.l] illustrating an exploded schematic view of the components of a watch according to the invention.

[0077] The drawings of the figures are not necessarily to scale. Like elements are generally denoted by like references in the figures. For the purposes of this document, identical or similar elements may have the same references. In addition, the presence of reference numbers or letters to the drawings cannot be considered as limiting, including when these numbers or letters are indicated in the claims.

[0078] Detailed description of embodiments of the invention

[0079] This section presents a detailed description of preferred embodiments of the present invention. The latter is described with particular embodiments and references to figures but the invention is not limited by them. In particular, the drawings or figures described below are only schematic and are not limiting.

[0080] The terms "first", "second", "third", etc. are used in this document exclusively to differentiate between different elements, without implying any order between these elements.

[0081] [Fig.l] illustrates components of a watch according to the invention, in exploded view. The watch comprises two parts of a bracelet 1, each of the parts being attached to the case and comprising means for closing the bracelet around a wrist of a user. The case 2 of the watch is closed by a display screen 3. The watch is configured to display the time on the screen, as well as other information such as weather forecasts, game information, or telephone contact information.

[0082] The watch includes a button 6 for starting / stopping the electronic circuit 5 so that a user can activate or deactivate an emission of the electromagnetic signal by the antenna of the electronic circuit by successive presses on the button.

[0083] The housing 2 is made of non-conductive polymer, and can therefore be crossed by the electromagnetic wave emitted by the antenna without attenuating it. The housing 2 contains the electronic circuit 5 comprising the antenna, and the electrical energy storage means 4 which is a rechargeable battery.

[0084] The case 2 is closed by the screen when the watch is in the assembled configuration. In the assembled configuration, the case is waterproof and airtight to protect the electronic circuit from moisture.

[0085] The antenna is electrically coupled to the electronic circuit.

[0086] When the electronic circuit is activated and the antenna emits the electromagnetic signal representing identification information of the watch, the watch can be part of a system allowing it to be geolocated, and executing a method according to the invention. The position of the watch can thus be determined and communicated to a user.

[0087] For example, the electronic circuit comprising the antenna is configured to emit the ultra-wideband electromagnetic signal and / or according to the Bluetooth standard and which is detectable by a first device, such as a smartphone, located near the watch, for example within a radius of 10m or 50m relative to the watch. The electromagnetic signal represents identification information for the watch, that is, it allows identification of the watch that emitted the electromagnetic signal.

[0088] The smartphone is further configured to locate the watch in response to receiving the electromagnetic signal, either by detecting that the watch is within a certain radius around it (following receiving the Bluetooth signal), or by accurately calculating the relative position of the watch with respect to it (following receiving the ultra-wideband signal).

[0089] The smartphone may belong to a watch owner or to third parties who are unknown to the watch owner. If the smartphone belongs to the watch owner, it may display the relative position of the watch to the phone to enable the watch owner to locate it.

[0090] If the smartphone belongs to a third person, it can be configured not to display the position of the watch and to send a second signal representing position information of the watch. For example, the position information is: its own position, or the position of the watch calculated on the basis of its own position and the relative position of the watch with respect to the smartphone (first device), or the relative position of the watch with respect to the smartphone (first device) separately from the position of the smartphone (first device). The smartphone of the third person generates and emits a second electromagnetic signal, transmitted to a second device such as another smartphone and belonging for example to the owner of the watch.The second electromagnetic signal represents the watch's position information as well as the watch's identification information.

[0091] The second signal may be transmitted to the second device by the first device via a wireless telecommunications network comprising, for example, a server. The server is configured to, based on the identification information of the watch, determine the second device to which to transmit the second signal, such that the identification and position information of the watch is transmitted to a second predetermined device. For example, the server may perform this operation by means of a database of the server matching the identification information of the watch and identification information of the second device.

[0092] The watch owner's smartphone can then display the watch's location to enable the owner to locate it. The advantage of this method is that, to locate the watch, it is possible to use a large number of third-party telephones positioned near the watch to locate the latter, without the owner of the watch having to contact them.

[0093] In summary, the invention relates to a locatable connected watch and methods for locating the watch. The watch comprises a strap 1 for attaching the watch to a user's wrist, a screen 3 for displaying time information, a housing 2 attached to the strap 1 and containing an electronic circuit 5 and an electrical energy storage means 4. The electronic circuit 5 comprises an antenna and is configured to transmit an electromagnetic signal representing identification information of the watch. At least a portion of the housing 2 covering the antenna is made of a material transparent to the electromagnetic signal.

[0094] It will be obvious to those skilled in the art that the invention is not limited to the embodiments and examples illustrated and / or described above, but that its scope is more broadly defined by the claims introduced below.

[0095] The present invention has been described above in relation to specific embodiments, which are of purely illustrative value and should not be considered as limiting. It will be readily apparent to those skilled in the art that the invention is not limited to the examples illustrated or described above, and that its scope is more broadly defined by the claims introduced below.

Claims

Claims

1. Connected watch comprising: • a strap (1) for attaching the watch to a user's wrist, • a screen (3) for displaying time information, • a case (2) attached to the strap (1) and containing: • an electrical energy storage means (4), • an electronic circuit (5) powered by the electrical energy storage means (4), characterized in that the electronic circuit (5) comprises an antenna and is configured to transmit an electromagnetic signal representing identification information of the watch, and in that at least a portion of the case (2) covering the antenna is transparent to the electromagnetic signal.

2. Watch according to claim 1, wherein the electronic circuit (5) is configured to emit the ultra high frequency (UHF) electromagnetic signal, preferably at a frequency between 2400 and 2483.5 MHz.

3. Watch according to any one of the preceding claims, wherein the electronic circuit (5) is configured to emit the ultra-wideband (UWB) electromagnetic signal, and preferably at frequencies between 3100 and 10600 MHz, preferably between 6000 and 8500 MHz.

4. A watch according to any preceding claim, wherein at least one face of the antenna is oriented towards the portion of the housing covering the antenna and is not separated from the housing by an electromagnetic shielding part capable of attenuating the electromagnetic signal.

5. Watch according to any one of the preceding claims, wherein the housing (2) further comprises an on / off button (6) of the electronic circuit (5) for starting or stopping the transmission of the electromagnetic signal by the electronic circuit (5).

6. Watch according to any one of the preceding claims, in which the case (2) is made of a polymer transparent to electromagnetic waves.

7. Watch according to any one of the preceding claims, provided with means for communicating via a mobile telephone network and / or via wifi.

8. A watch according to any preceding claim, wherein the electrical energy storage means (4) is also configured to supply electrical energy to the display (3) and / or other internal electronic circuits of the watch.

9. Method for locating a watch according to any one of the preceding claims, comprising: • wireless transmission of an electromagnetic signal representing identification information of the watch by an electronic circuit (5) located in the watch and comprising an antenna, • reception of the electromagnetic signal by a first device distinct from the watch, • in response to the reception of the electromagnetic signal by the first device, and by means of the first device: determination of a relative position of the watch with respect to the first device and display of the relative position on a screen of the first device.

10. Method for locating a watch according to any one of claims 1 to 8, comprising: • wireless transmission of an electromagnetic signal representing identification information of the watch by an electronic circuit (5) located in the watch and comprising an antenna, • reception of the electromagnetic signal by a first device distinct from the watch, • in response to the reception of the electromagnetic signal by the first device, and by means of the first device: determination of a position of the first device and transmission to a second device of a second signal representing the identification information of the watch and the position of the first device, • receiving the second signal by the second device and displaying the position of the first device on a screen of the second device.

11. Method according to the preceding claim, in which the electromagnetic signal emitted by the electronic circuit (5) is at ultra high frequency (UHF), preferably at a frequency between 2400 and 2483.5 MHz.

12. Method for locating a watch according to any one of claims 1 to 8, comprising: • wireless transmission of an electromagnetic signal representing identification information of the watch by an electronic circuit (5) located in the watch and comprising an antenna, • reception of the electromagnetic signal by a first device distinct from the watch, • in response to the reception of the electromagnetic signal by the first device, and by means of the first device: determination of a position of the watch and transmission to a second device of a second signal representing the identification information of the watch and the position of the watch, • reception of the second signal by the second device and display of the position of the watch on a screen of the second device.

13. Method according to one of claims 10 to 12, in which the second signal is transmitted to the second device via a server comprising a database matching the identification information of the watch and identification information of the second device, and comprising: • in response to the reception of the second signal by the server, and by means of the server: determination of the second device on the basis of the identification information of the watch and the database, • transmission by the server of the identification information of the watch and of the position of the watch and / or of the first device to the second device determined by the server.

14. 17 Method according to one of claims 9, 12, or 13 when dependent on claim 12, in which the electromagnetic signal emitted by the electronic circuit (5) is ultra wide band (UWB), and preferably at frequencies between 3100 and 10600 MHz, preferably between 6000 and 8500 MHz.

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