The Quantum FW9T Transmitter provides simple operation, increased range, & lower cost. You can match sets of Free Xwire units to work together on the same channel, or separate groups of Free Xwires can work independently on different channels, with up to 32 individual Channel/ Zone settings at your disposal, & 256 possible lighting combinations. Compatible with an FW7Q, FW8R, or an upgraded FW10w Transceiver. Mount a FW9T or FW10/10w transmitter & FW12 Hot Shoe Adapter to the camera & be totally wireless. Or, add a "D" or " Dw" series QTTL adapter to the camera & transmit your cameras f/stop, ISO, & TTL exposure information to the remote Qflash 5d. Might require additional cables or accessories, depending on flash and/or camera used. Please consult the manufacturers website for complete Free Xwire component chart.