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. 8 Independent Channels 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. 4 Zone Control Plus Local FreeXwire controls one Local Zone and four wireless Zones for flash or motor drive. You can activate any one Zone, or any combination of Zones 1,2,3,4 and Local. Switch your lighting instantly, remotely. Select and trigger flashes, cameras, or combinations of them, from your remote position. Wireless TTL A FreeXwire connected to one of Quantum`s TTL adapters transmits TTL information to any number of remote FreeXwire/Qflash combinations. A "local" Qflash will synchronize also. Wireless Auto Without a TTL adapter, a local Qflash & FreeXwire can control exposures of any number of remote Qflash/FreeXwire combinations. Convenient Connections You can hot shoe sync with FreeXwire`s optional Uni-Mod module, use twin blade sync cords, or numerous other cords. FreeXwires use Quantum`s motor drive cords for remote wireless shutter. Tow Special Motor Drive Features Use FREEXWIRE`s two step motor drive cords to keep your camera meter and focus function continuously on (as in pressing the shutter button half way). Your camera will be ready for instant shutter release. Or select motor drive "delay" to command a camera to "wake up", focus and meter, then release the shutter.