Each FreeXwire can be set to transmit or receive. Four FreeXwires can serve as two send/receive systems, operating on two different Channels. Or all FreeXWires can be set on the same Channel so that they can operate as one system - a transmitter and three receivers.
The FreeXwire has eight unique Channel Codes. FreeXwire units set to one Channel cannot activate FreeXwires set to different Channels. You control the Channel Code to make FreeXwire units work together or independently, as required. There are 32 individual Channel/Zone settings at your disposal, and 256 possible lighting combinations!