RADIO TELEPHONE SET

PURPOSE:To make an automatic check on the intensity of a received electric field by at least one of a master device and a telephone set when a radio telephone set is not in use, by providing a controlling means for signals of the master device and radio telephone set and a state display means for the radio telephone set. CONSTITUTION:The signal control part 12 of a master device 10 when enqueued sends a calling signal automatically and the reception level of a transmitted radio wave, modulated by an answer signal to said signal, from a radio telephone set 30 is detected. When the reception level is below a prescribed one, the detection that the telephone set 30 is not within a communication range is performed and if the answer signal from the telephone set 30 is stopped in a calling signal transmission period, that is detected to detect the drop in power voltage of the telephone set 30. The signal control part 33 of the telephone set 30, on the other hand, detects its drop in power voltage and sends an answer signal to the device 10 by receiving the calling signal from the device 10 in this case; when no call signal is sent from the device 10 even a prescribed time later, that is detected to stop the transmission of the answer signal.