Cebek TL-615 is a dual channel, receiver which incorporates feedback from the transmitter. The Receiver and Transmitter communicate with each other every 10 seconds. Should this link be broken the receiver will automatically revert to a 'safe' setting. This combination of Receiver/Transmitter is ideal were the receiver must have radio contact with the transmitter. (i.e. The driver of a vehicle moves out of range of a security gate the gate will revert to a closed position on loss of signal.) It is a Group 3 receiver and operates on a carrier frequency of 433.92MHz.