The Quantum Instruments Free Xwire FW89 Digital Transmitter/ Receiver Set consists of the FW9T Transmitter & FW8R Receiver. The FW8R can be used to receive a wireless radio flash trigger signal from an FW10w or FW9T transmitter connected to the camera. The FW8R receiver can also be used as a receiver hooked up to the camera with a Quantum Two-Step Motor Drive cord to allow for remote wireless triggering of the shutter release. With a 2-step cord you keep your cameras meter & focus function continuously on (as in pressing the shutter button half way). Mount a FW9T 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 check manufacturers web site to see a complete Free Xwire component chart.