An elastic buckle is arranged on the side face of a
machine shell, when the
machine shell is installed in the shell, the elastic buckle is deformed through a
machine shell groove, after the maximum deformation point is reached, the machine shell continues to be pressed, and after the deformation
recovery sound of the elastic buckle is heard, the machine shell is installed to reach the set buckle position; according to the utility model, the housing is arranged on the housing, the housing is tightly clamped on the housing, the ribs limit the housing, the housing is prevented from shaking after being mounted, the trapezoidal housing is more convenient to
mount, the mounting can be quickly completed, the housing does not need to be locked by screws, the production efficiency is improved, and the production cost is reduced. Meanwhile, the guide columns and the supporting columns are adopted between the
surface cover and the base, so that the mounting connection and
assembly of the
surface cover and the base are facilitated, and the
surface cover and the base which are assembled are more stable and better in aesthetic property. The
magnet and the detection hole are arranged in the casing to detect the placement condition of the fire-fighting telephone, and the display screen and the indicating lamp are matched to display the state, so that the state and the use of the fire-fighting
telephone switchboard can be conveniently checked.