To provide a reliable terminal device which can securely transmit and receive signals while holding functions of securely confirming whether the terminal device is in a normal monitor state by blinking a display means in constant cycles without any change irrelevantly to the number of connected terminal devices and also reducing the total current consumption of a system.

Terminal devices are connected to a fire receiver and given individual addresses, and the fire receiver individually recognizes the terminal devices with the addresses and sends and receives coded transmit signals, so that the terminal devices are used for facilities for monitoring and controlling. A reception part 24 which receives the transmit signal from the fire receiver, an oscillation part 30 which outputs a signal in specific timing at intervals of about 3 to 5 seconds for blinking, and a blinking part 26 which blinks an LED 27 at a specific position of the transmit signal according to the signal reception of the reception 24 after the oscillation part 30 generates the output signal are provided.