Cebek TL-616 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. Remotely activated lights in a warehouse switch off if the link between receiver and transmitter are broken.) It is a Group 3 receiver and operates on a carrier frequency of 433.92MHz.