Purpose: the protective device that one possessed loses, which is arranged to be exported with reception signal from the work that possesses for being connected to the transmitter to the receiver that possess, to be indicated, to prevent the loss possessed. Construction: the protective device that one possessed loses includes a transmitter module (10), a receiver module (20), a controller (30), a display unit (40), an alarm song generating set (50) and a key input unit (60). Transmitter module (10) is connected to object and regularly transmits RF signal. Receiver module (20) enters identification code transmitter and receiver from transmitter module (10) received RF signal, with decoding. Signal is controlled according to controller (30) output display of identification code. Display unit (40) shows that the state of user possesses according to display control signal. It is outdoor except using that alarm song generating set (50) notifies that user possesses.
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