| 摘要 |
PURPOSE:To confirm the prescribed position of a transmitter, to easily miniaturize and to control a battery voltage without fail by linking a slave transmitting device and a master receiving alarm device and keeping the electric power source switch of respective circuits of both devices to an OFF condition. CONSTITUTION:When a slave transmitting device 2 is fitted to a master receiving alarm device 1, the supply to a transmitting function part and a receiving function part comes to an OFF condition. Since respective electric power source batteries 15 and 21 of both devices are connected through both connectors 10 and 11, the voltage of the batteries 15 and 21 is supervised all at once by a battery exhaustion circuit 19. Thus, when the battery exhaustion and the reduction of the voltage are detected, an electric power source switch circuit 18 of the master receiving alarm device 1 functions and the action electric power source is supplied to a microcomputer 17. By the signal from the battery turning off circuit 19, the microcomputer 17 is operated and an alarm sound generating device 20 is made to ring.
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