Full power range (from 10.5 to 31Vdc). Microcontroller-operated functions. FSK modulation. Operating temperatures from -15C to +70C. Indication of the system operating status, errors and problems by means of LED and seven-segment display. Protection against polarity inversion. Protection against low battery. 50 transmitters can be stored. Translation mode to activate more receivers, installed in different spots, by means of one transmitter. Programmable digital filter. Possible connection to an external antenna.