The Model D-22C 2-Channel, 2-Button Independent Code Transmitter is a two-channel transmitter that can initiate two separate functions. The transmitter contains two eight-position digital coding switches. Each pushbutton can send any one of the 256 digital codes. This transmitter is used in remote switching applications where a portable two-channel transmitter is required and two separate receivers, each programmed with their own digital code, are used. Each transmission causes the red LED indicator on the front of the transmitter to light, showing that the transmitter is sending a signal and that the battery is in good condition.