Electronic apparatus with alarm function

A portable telephone of the present invention is provided with a portable telephone body and a flipper which is detachable from the body. The body is provided with a transmission and receiving section, a speaker section, and an transmission means for generating at least one of a warning signal for announcing that the flipper is disconnected from the portable telephone and a call signal when receiving a call-in. The flipper is provided with a microphone section and a receiving means for receiving warning signal and call-in signal. By structuring a portable telephone as described above, a user of this portable telephone can recognize a call-in and recognize theft or misplacing, as long as the user carries always the flipper. A stranger can not used this portable telephone using a wrong flipper because the portable telephone body operates only when a specified flipper is connected.