Anti-theft system, related method of use and computer program

Abstract

The anti-theft system (1) comprises: one wearable device (2) by a user (U); one identification device (3) associable with an item to be monitored (O), the wearable device (2) and the identification device (3) being operationally connected to each other remotely in a wireless mode; control means (4) coupled to at least one of either the wearable device (2) or the identification device (3), the control means (4) comprising detecting means (5) configured to detect a distance between the wearable device (2) and the identification device (3) by detecting a mutual departure thereof; wherein: the wearable device (2) comprises first signaling means (6) configured to generate a first alarm signal (7) perceptible to the user (U); the identification device (3) comprises second signaling means (8) configured to generate a second alarm signal (9) broadcast in the surrounding environment (10) to the identification device (3); the first and second signaling means (6, 8) being configured to generate the respective alarm signals (7, 9) as a result of the departure of the wearable device (2) from the identification device (3).

Description

[0001] ANTI-THEFT SYSTEM, RELATED METHOD OF USE AND COMPUTER PROGRAM

[0002] Technical Field

[0003] The present invention relates to an anti-theft system, in particular one that allows an item to be monitored and, if that item is moved away by a user, alerting the latter automatically.

[0004] Background Art

[0005] Anti-theft systems are known in the prior art which involve applying antishoplifting tags to items to be monitored, such as products commonly displayed in retail stores. Known anti- shoplifting tags are attached to the displayed products and are capable of emitting electromagnetic signals when they are in the proximity of an anti- shoplifting barrier.

[0006] In fact, known anti-theft systems involve the installation of an anti- shoplifting barrier at the store exit. The anti-shoplifting barrier detects and signals the presence of each tag within a certain range by generating an electromagnetic field. In particular, when an anti- shoplifting tag that has not been properly deactivated, for example following a purchase, enters the range of an antishoplifting barrier, it affects this electromagnetic field and triggers an acoustic alarm in the area surrounding the barrier.

[0007] The anti-shoplifting system described above is an effective deterrent against theft, but it has limitations due to the need to install one or more anti -shoplifting barriers and, therefore, to identify an area from which products cannot be picked up. Specifically, anti-shoplifting barriers cannot be used to monitor personal items that are not on display in a store, such as a wallet, cell phone or a bag.

[0008] In order to support and alert a user of a possible theft of a personal item, Bluetooth tags that can be constrained to the item to be monitored have been developed. These Bluetooth tags are in constant communication with the user's smartphone via a Bluetooth connection. The smartphone is then configured to show the user a warning if the Bluetooth tag moves away from the smartphone.

[0009] An additional system provides, as an alternative or in conjunction with Bluetooth tags, for the use of a GPS locator which can be paired with the item to be monitored and with the smartphone. This locator transmits its position in real time to the smartphone or to a software platform. The user can then locate the position of the item on a map and can receive an alarm on their smartphone if the item leaves a predefined area.

[0010] However, the systems with Bluetooth tags and with GPS locators require the user to have access to their smartphone in order to receive the alert and track the item being monitored if it has been stolen. In fact, if the user is robbed of both the item with Bluetooth tag or GPS locator and the smartphone, the anti-theft system is unable to alert the user and assist them in recovering the stolen items.

[0011] Description of the Invention

[0012] Therefore, the need is known to develop an anti-theft system, a method and a computer program that allow an item to be monitored and the user to be alerted automatically through alarms transmitted to the user and broadcast in the user’s surroundings if the item is moved away from the user.

[0013] One object of this description is to provide an anti-theft system, a method and a computer program that allow an item to be monitored and the user to be alerted in a timely and automatic maimer if the item is moved away from the user.

[0014] A further object of the present invention is to provide an anti-theft system, a method and a computer program that allow different alarm signals to be generated and transmitted which are able to alert the user and broadcast in the user’s surroundings.

[0015] A further object of the present invention is to provide an anti-theft system, a method and a computer program that allow a stolen item to be easily and quickly traced back to the user.

[0016] Another object of the present invention is to devise an anti-theft system, a method and a computer program that allow the aforementioned drawbacks of the prior art to be overcome in a simple, rational, easy and effective to use as well as affordable solution.

[0017] The aforementioned objects are achieved by the anti-theft system having the characteristics of claim 1.

[0018] The aforementioned objects are achieved by the method according to claim 9.

[0019] One or more of the aforementioned objects are achieved by the computer program according to claim 10.

[0020] Other characteristics and advantages of the present invention will become more apparent from the description of a preferred, but not exclusive embodiment, illustrated by way of a non-limiting example, in the accompanying drawings, in which:

[0021] Figure 1 schematically shows an anti-theft system according to the present description in a condition of use;

[0022] Figure 2 is a block diagram of the anti-theft system according to the present description;

[0023] Figure 3 shows a block diagram of a detail of the anti -theft system according to the present description.

[0024] Embodiments of the Invention

[0025] With particular reference to these figures, reference numeral 1 globally denotes, in general, an anti-theft system comprising at least one wearable device 2 which is wearable by a user U and at least one identification device 3 associable with an item to be monitored O. The wearable device 2 and the identification device 3 are, in particular, operationally coupled to each other. In detail, the system 1 may comprise a plurality of identification devices 3 and the wearable device 2 is operationally connectable to each identification device of such a plurality of identification devices 3. In particular, each identification device of such a plurality of identification devices may be associated with a respective item to be monitored.

[0026] A non-limiting or exhaustive list of items to be monitored may comprise: a cell phone, a tablet, a computer, a bag, a backpack, a suitcase, a wallet, a bicycle, a scooter, a vehicle.

[0027] According to one aspect, the wearable device 2 may be configured to be closed in a loop around a portion of the user’s body. The wearable device 2 is configured to be in contact with the portion of the user’s body when the antitheft system is in use.

[0028] For example, the wearable device 2 may comprise one or more of a smartwatch, a fitness tracker, a bracelet, a necklace or a ring. Furthermore, for example, when the wearable device comprises and / or is defined by a bracelet, such wearable device has a portion configured to be placed in contact with a wrist of the user U. When such wearable device 2 is defined and / or comprises a ring, the wearable device 2 comprises at least one portion adapted to be placed in contact with a finger of the user U.

[0029] The wearable device 2 may have shape and size adapted to allow the user U to wear the wearable device comfortably and without any difficulty. In one embodiment, the wearable device 2 has dimensions of 42x38x12 millimeters.

[0030] The wearable device 2 can be configured for the interaction with the user and can have means adapted to show the user the time and / or other operation data of the wearable device itself.

[0031] The identification device 3 is adapted to be attached to the item to be monitored O. For example, the identification device may have an area for the attachment and / or bonding to the item to be monitored O. In one embodiment, the identification device 3 is bonded to the item to be monitored O.

[0032] According to one aspect, the identification device 3 can be coupled to the item to be monitored O in a removable maimer.

[0033] The identification device 3 may have shape and size compatible with the item to be monitored. The identification device 3 may be circular, rectangular or square in shape.

[0034] According to one aspect, the identification device 3 can be made in such a way that it is difficult for an intruder or pickpocket to detect it when coupled to the item to be monitored. The identification device 3 may, e.g., be rectangular in shape and designed to resemble a typical credit card, ATM card and / or other type of card usually carried in a wallet. In particular, in one embodiment, the identification device 3 has dimensions of 85 x 54 x 3.2 millimeters.

[0035] Advantageously, the shape and dimensions of the wearable device 2 and of the identification device 3 ensure high portability and easy integration of these devices in the contexts of use and application of the invention.

[0036] The wearable device 2 and the identification device 3 are operationally connected to each other at a distance, specifically in a wireless mode. In particular, the wearable device 2 and the identification device 3 are configured to communicate with each other via a wireless personal area network and / or a personal area network (PAN) technology. Specifically, the wearable device 2 and the identification device 3 communicate with each other through one or more of a WiFi, Bluetooth and / or Bluetooth Low Energy network.

[0037] The anti-theft system comprises control means 4 coupled to at least one of either the wearable device 2 or the identification device 3. The control means 4 comprise detecting means 5 configured to detect a distance between the wearable device 2 and the identification device 3 by detecting a mutual departure thereof. In particular, the control means are configured to detect the distance between the wearable device and the identification device constantly and in real time. In detail, as will be explained below, the control means are configured to compare the detected distance with a predefined threshold distance beyond which the mutual departure of the wearable device and of the identification device is considered excessive.

[0038] According to one aspect, the wearable device 2 comprises first signaling means 6 configured to generate a first alarm signal 7 perceptible by the user U. In particular, the first signaling means 6 comprise a vibrating motor 6a configured to generate such a first alarm signal 7. In detail, the first alarm signal 7 is of the type of a vibration. More specifically, the vibrating motor 6a is configured to generate this vibration in such a way that the vibration is perceptible by the user U at the body portion which is in contact with the wearable device. For example, the wearable device 2 may be configured to generate and transmit such a vibration at a finger and / or a wrist of the user U so as to alert the user that the wearable device and the identification device are excessively distant from each other.

[0039] The identification device 3 comprises second signaling means 8 configured to generate a second alarm signal 9 broadcast in the surrounding environment 10 to the identification device 3. In particular, the second signaling means 8 comprise an electric acoustic and / or light alarm device which are adapted to generate the second alarm signal 9. The second alarm signal 9 may be of the type of an acoustic and / or light stimulus broadcast in the environment surrounding the identification device and the user U. This electric acoustic and / or light alarm device is specifically configured to generate this acoustic and / or light stimulus. The first and second signaling means 6, 8 are configured to generate respective alarm signals 7, 9 as a result of the departure of the wearable device 2 from the identification device 3. In particular, the first and second signaling means 6, 8 are configured to generate the respective alarm signals 7, 9 when the distance between the wearable device and the identification device 3 exceeds a predetermined threshold distance.

[0040] Advantageously, the anti-theft system of the invention can be effectively used by the user in crowded places, for example on urban means of transport such as trains and subways, or shopping centers, so as to reduce the chances of being the victim of theft.

[0041] In one embodiment, each of the wearable device 2 and of the identification device 3 has a working configuration and an alarm configuration. In particular, in the working configuration of the wearable device and of the identification device, the respective first or second signaling means 6, 8 are deactivated. In detail, in the working configuration, the wearable device and the identification device communicate with each other on a continuous basis. More specifically, in the working configuration of each of the devices, the detecting means 5 detect the distance between the wearable device and the identification device on a continuous basis.

[0042] In the alarm configuration of the wearable device and of the identification device, the respective first or second signaling means 6, 8 are activated and generate the first and second alarm signals 7, respectively.

[0043] Advantageously, in the alarm configuration, each of the wearable device and of the identification device alerts the user, and possibly other users in the surrounding environment, of a potential theft by generating the first and second alarm signals.

[0044] The control means 4 are configured to switch the wearable device 2 and / or the identification device 3 between the working configuration and the alarm configuration depending on the mutual departure of the wearable device 2 from the identification device 3.

[0045] In particular, each of the wearable device and of the identification device can be switched from the working configuration to the alarm configuration and / or vice versa by the control means 4.

[0046] In detail, the control means 4 are configured to automatically switch the wearable device 2 and the identification device 3 to the alarm configuration if the detected distance is greater than or equal to a threshold distance. The control means 4 can also be configured to automatically switch the wearable device 2 and the identification device 3 to the working configuration if the detected distance is lower than the threshold distance.

[0047] In one embodiment, the detecting means 5 comprise at least a first and a second transceiver 11, 12 mounted on the wearable device 2 and on the identification device 3, respectively. The first transceiver 11 and the second transceiver 12 are configured to exchange electromagnetic signals 13 remotely, in particular in a wireless mode.

[0048] In detail, the first transceiver 11 and the second transceiver 12 are configured for receiving and transmitting ultra-wideband electromagnetic signals, in particular for two-way localization.

[0049] The detecting means 5 can be configured to detect the distance between the wearable device 2 and the identification device 3 depending on the exchange of electromagnetic signals 13 between said transceivers 11, 12. In particular, the detecting means 5 are configured to detect the distance between the wearable device 2 and the identification device 3 thus determining the time of flight of the electromagnetic signals 13 exchanged between the first transceiver 11 and the second transceiver 12.

[0050] In one embodiment, the control means 4 comprise at least a first control module 14 and a second control module 15 mounted on the wearable device 2 and on the identification device 3, respectively. The first and the second control modules 14, 15 are advantageously of the low energy consumption type.

[0051] The first control module 14 is in signal communication with the first transceiver 11 and with the first signaling means 6. In particular, the first control module 14 is in signal communication with the vibrating motor 6a.

[0052] The second control module 15 is in signal communication with the second transceiver 12 and with the second signaling means 8. In particular, the second control module 15 is in signal communication with the electric acoustic and / or light warning device 8a.

[0053] The first control module 14 and the second control module 15 are configured to switch the wearable device 2 and the identification device 3 between the working configuration and the alarm configuration, respectively. In detail, the first control module 14 and the second control module 15 are configured to activate / deactivate the first signaling means 6 and the second signaling means 8, respectively. The first control module and the second control module can be configured to control the first transceiver and the second transceiver, respectively, for the transmission and receiving of these electromagnetic signals. In one embodiment, each of the first control module and the second control module is configured to detect the distance between the wearable device and the identification device by detecting a mutual departure thereof.

[0054] In one embodiment, only one of either the first control module or the second control module is configured to detect the distance between the wearable device and the identification device by detecting a mutual departure thereof. In other words, the distance between the wearable device and the identification device can be detected by both the wearable device and the identification device or by only one of either the wearable device or the identification device.

[0055] According to one aspect, the wearable device 2 and the identification device 3 comprise a first and a second battery module 18a, 18b, respectively.

[0056] The first battery module 18a of the wearable device 2 is in electrical communication with the first transceiver 11, the first control module 14 and the first signaling means 6 for supplying electrical energy.

[0057] The second battery module 18b of the identification device 3 is in electrical communication with the second transceiver 12, the second control module 15, and the second signaling means 6 for supplying electrical energy.

[0058] In detail, the wearable device 2 and the identification device 3 may comprise means for monitoring the respective battery module 18a, 18b and for the optimization of the operation of the same battery module.

[0059] The anti-theft system 1 may also comprise interface means 16 operationally connected to at least one of either the wearable device 2 or the identification device 3 remotely in a wireless mode. The wearable device 2 is configured to communicate with the interface means 16 through a wireless personal area network and / or a personal area network (PAN) technology. Specifically, the wearable device 2 and the interface means 16 communicate with each other through one or more of a WiFi, Bluetooth and / or Bluetooth Low Energy network.

[0060] In one embodiment, the interface means 16 comprise a personal device of the user. For example, the personal device of the user may be a mobile phone, a tablet or a computer. The personal device of the user is operationally connectable to the wearable device 2. In detail, the personal device of the user U may be of the type of an Android or iOS operating system and adapted to install applications and / or software programs.

[0061] In particular, at least one of either the wearable device 2 or the identification device 3 is configured to send respective operation data to the other of either the wearable device 2 or the identification device 3. The operation data may represent one or more of the following: type of device (wearable device or identification device), activation / deactivation status of the first and / or second signaling means, location of the wearable device, location of the identification device, charge percentage of the first battery module and / or of the second battery module, time of flight of the electromagnetic signals exchanged between the wearable device and the identification device, activation / deactivation of the first and / or second transceiver, type of configuration (working or alarm configuration) in which the wearable device is located, type of configuration (working or alarm configuration) in which the identification device 3 is located. According to one aspect, the interface means 16 are configured to receive from at least one of either the wearable device 2 or the identification device 3 the operation data of the wearable device 2 and the operation data of the identification device 3. In detail, the interface means are configured to receive from only one of either the wearable device or the identification device both the operation data of the wearable device and the operation data of the identification device.

[0062] The interface means 16 are also configured to generate a third alarm signal 17 perceptible by the user U depending on the distance between the wearable device 2 and the identification device 3, in particular depending on the mutual departure of the wearable device and of the identification device. In detail, the third alarm signal 17 may be of the type of an audio and / or video notification. The personal device comprises a screen adapted to display such audio and / or video notification to the user U when the distance between the identification device and the wearable device is greater than or equal to the threshold distance. In one embodiment, the interface means 16 are configured to display to the user U the operation data representative of the operation of the wearable device 2 and / or of the identification device 3. In particular, the personal device is adapted to display to the user the operation data of the wearable device and of the identification device via a screen of the personal device.

[0063] For example, the user can use the personal device to find out the charge status of the battery modules of the identification device and of the wearable device so that these devices can be recharged before the energy of the respective battery modules is exhausted.

[0064] According to a further aspect, the present invention relates to a method for allowing the user U to be alerted in the event of potential theft.

[0065] The method comprises the phases of:

[0066] - providing the user U with an anti-theft system 1 in accordance with any of the embodiments of the present description,

[0067] - wearing the wearable device 2, particularly in contact with the body portion of the user U,

[0068] - associating the identification device 3 with an item to be monitored O.

[0069] The phase of associating the identification device with the item to be monitored may comprise attaching and / or bonding the identification device to the item. Alternatively, the phase of associating the identification device with the item comprises the phase of connecting the identification device to the item in a removable maimer.

[0070] In particular, the phase of wearing the wearable device comprises the sub-phase of closing the wearable device in a loop around a body portion of the user.

[0071] The method comprises the phases of: - detecting a mutual departure of the wearable device 2 and of the identification device 3 by means of the detecting means 5,

[0072] - generating a first alarm signal 7 perceptible by the user U through the first signaling means 6 and a second alarm signal 9 broadcast in the surrounding environment 10 to the identification device 3 through the second signaling means 8 depending on the departure of the wearable device 2 and of the identification device 3.

[0073] According to one aspect, detecting a mutual departure of the wearable device and of the identification device comprises the sub-phases of:

[0074] - detecting a distance between the wearable device and the identification device,

[0075] - comparing the detected distance with a threshold distance.

[0076] In detail, the threshold distance may be predefined or set by the user U. The method comprises the phase of setting a threshold distance.

[0077] In particular, detecting a distance comprises the sub-phases of:

[0078] - exchanging electromagnetic signals between the wearable device and the identification device,

[0079] - calculating a time of flight of such electromagnetic signals exchanged between the wearable device and the identification device.

[0080] In one embodiment, the phase of generating the first alarm signal comprises the sub-phase of switching the wearable device to the alarm configuration, in particular if the detected distance is greater than or equal to the threshold distance. In detail, the phase of generating the first alarm signal comprises activating the first signaling means and / or generating a vibration perceptible by the user U.

[0081] In one embodiment, the phase of generating the second alarm signal comprises the sub-phase of switching the identification device to the working configuration, in particular if the detected distance is greater than or equal to the threshold distance. In detail, the phase of generating the second alarm signal comprises the sub-phase of activating the second signaling means and / or generating an acoustic and / or light stimulus.

[0082] According to one aspect, the method comprises the phase of generating the third alarm signal through the interface means depending on the mutual departure of the wearable device and of the identification device. The phase of generating the third alarm signal comprises generating an audio and / or video notification and / or displaying said third alarm signal to the user through the personal device. In one embodiment, the method comprises the phase of:

[0083] - switching the wearable device from the alarm configuration to the working configuration if the distance between the wearable device and the identification device is lower than the threshold distance, and / or

[0084] - switching the identification device from the alarm configuration to the working configuration if the distance between the wearable device and the identification device is lower than the threshold distance.

[0085] The method may comprise one or more of the following phases:

[0086] - exchanging respective operation data of the wearable device and of the identification device between the wearable device and the identification device,

[0087] - exchanging the operation data of the wearable device and of the personal device between the wearable device and the personal device,

[0088] - receiving from the wearable device 2 and / or from the identification device 3 the operation data of the wearable device 2 and the operation data of the identification device 3,

[0089] - displaying to the user U the operation data representative of the operation of the wearable device 2 and / or of the identification device 3.

[0090] The method may comprise the phase of transmitting operation data from the wearable device to the identification device and / or vice versa, and the phase of transmitting operation data from the wearable device to the personal device.

[0091] According to a further aspect, the present invention relates to a computer program and a memory unit comprising such a computer program.

[0092] The computer program comprises instructions which, when the program is run by a computer, cause the computer to perform one or more phases of the method described above.

[0093] In particular, the instructions are executable by the control means 4 of the antitheft system 1 in accordance with any of the embodiments and cause said control means 4 to perform one or more phases of the method of the invention. More specifically, the program can be installed on at least one of either the wearable device 2 or the identification device 3.

[0094] Advantageously, at least one of either the first control module 14 or the second control module 15 is configured to execute one or more of the program instructions.

[0095] In particular, the program is installed on both the wearable device 2 and the identification device 3.

[0096] In this way, each of these devices is configured, through the execution of the program, to autonomously perform the method described above.

[0097] Preferably, the program installed on the wearable device 2 and on the identification device 3 is substantially the same, except for at least one instruction that tells the program itself on which of the devices 2, 3 it is installed.

[0098] In one embodiment, the computer program comprises an application that can be installed on the personal device of the user U. For example, the computer program can be installed on a smartphone and / or tablet. In particular, the computer program can be used on Android and iOS systems.

[0099] In one embodiment, the computer program is configured to enable wireless communication between the wearable device and the personal device of the user U and / or between the wearable device and the identification device.

[0100] The computer program is configured for access with credentials and to provide a working interface with digital representations of the wearable device and / or of the identification device. In other words, the user can access a reserved space or working interface where they can display a digital representation of the wearable device and of the identification device and the operation data relating thereto.

Claims

CLAIMS1 ) Anti-theft system ( 1 ) comprising : at least one wearable device (2) by a user (U); at least one identification device (3) associable with an item to be monitored (O), said wearable device (2) and said identification device (3) being operationally connected to each other remotely in a wireless mode; control means (4) coupled to at least one of either the wearable device (2) or the identification device (3), the control means (4) comprising detecting means (5) configured to detect a distance between said wearable device (2) and said identification device (3) by detecting a mutual departure thereof; characterized by the fact that: said wearable device (2) comprises first signaling means (6) configured to generate a first alarm signal (7) perceptible to the user (U); said identification device (3) comprises second signaling means (8) configured to generate a second alarm signal (9) broadcast in the surrounding environment (10) to said identification device (3); said first and second signaling means (6, 8) being configured to generate the respective alarm signals (7, 9) as a result of the departure of the wearable device (2) from said identification device (3).2) Anti-theft system (1) according to the preceding claim, wherein each of the wearable device (2) and the identification device (3) has: a working configuration, wherein the respective first or second signaling means (6, 8) are deactivated; and an alarm configuration, wherein the respective first or second signaling means (6, 8) are activated and generate the first and the second alarm signals (7, 9), respectively; wherein the control means (4) are configured to switch the wearable device (2) and / or the identification device (3) between the working configuration and the alarm configuration depending on the departure of the wearable device (2) and of said identification device (3).3) Anti-theft system (1) according to the preceding claim, wherein the control means (4) are configured to:automatically switch the wearable device (2) and / or the identification device (3) to the alarm configuration if the detected distance is greater than or equal to a threshold distance; automatically switch the wearable device (2) and / or the identification device (3) to the working configuration if the detected distance is lower than the threshold distance.4) Anti-theft system (1) according to any one of the preceding claims, characterized by the fact that said detecting means (5) comprise at least a first and a second transceiver (11, 12) mounted on said wearable device (2) and on said identification device (3) respectively, and configured to exchange electromagnetic signals (13) between them remotely, in a wireless mode, said detecting means (5) being configured to detect the distance between said wearable device (2) and said identification device (3) depending on the exchange of electromagnetic signals (13) between said transceivers (11, 12).5) Anti-theft system (1) according to the preceding claim, wherein the detecting means (5) are configured to detect the distance between the wearable device (2) and the identification device (3) by determining the time of flight of said electromagnetic signals (13) exchanged between said first transceiver and said second transceiver (11, 12).6) Anti-theft system (1) according to any one of the preceding claims, wherein said control means (4) comprise at least a first and a second control module (14, 15) mounted on said wearable device (2) and on said identification device (3) respectively, in signal communication with the first and the second transceiver (11, 12) and with the first and second signaling means (6, 8) respectively, the first and the second control modules (14, 15) being configured to switch the wearable device (2) and the identification device (3) between the working configuration and the alarm configuration, respectively.7) Anti-theft system (1) according to any one of the preceding claims, wherein: the first alarm signal (7) is of the type of a vibration, and / or the second alarm signal (9) is of the type of an acoustic and / or light stimulus.8) Anti-theft system (1) according to any one of the preceding claims, comprising interface means (16) operationally connected to at least one of either the wearable device (2) or the identification device (3) remotely in a wireless mode, at least one of either the wearable device (2) or the identification device (3) being configured to send respective operation data to the other of either the wearable device (2) or the identification device (3), the interface means (16) being configured to receive from the wearable device (2) and / or from the identification device (3) the operation data of the wearable device (2) and the operation data of the identification device (3).9) Method comprising the phases of: providing a user (U) with an anti -theft system (1) in accordance with any one of the preceding claims, wearing the wearable device (2), associating the identification device (3) to an item to be monitored (O), detecting a mutual departure of the wearable device (2) and of the identification device (3) by means of said detecting means (5), generating a first alarm signal (7) perceivable by the user (U) through the first signaling means (6) and a second alarm signal (9) broadcast in the surrounding environment to said identification device (3) through said second signaling means (8) depending on the departure of said wearable device (2) and of said identification device (3).10) Computer program comprising instructions that, when the program is executed by the control means (4) of an anti -theft system (1) in accordance with any one of the preceding claims 1 to 8, cause said control means (4) to execute one or more phases of the method in accordance with the preceding claim.

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