The FlexTT5 transceiver shares the MiniTT1 transmitter’s(ordered sepretaly) features and adds the advanced auto-sensing and relay modes introduced with the PocketWizard Plus II, as well as camera and flash ports for PocketWizard cable connection to any camera or flash system. Used as a transmitter, the FlexTT5 can provide TTL auto flash at distances of up to 800 feet* and conventional triggering up to 1200 feet* with the aid of a flip-up antenna.The unit feature a two-position channel selector that is factory programmed to the PocketWizard classic channel one and two. Using the included software and USB port, you can program either channel to any of the PocketWizard system’s 32 digitally encoded channels and four zones. A special Learning Mode enables simple, in-the-field programming of all channels. Compatible with the following: Canon DSLR Cameras: 1Ds MKIII, MKII; 1D MKIII; MKII; 1DMKII N; 5D, 5D MKII; 20D, 30D, 40D, 50D; Rebel XT/350D, Rebel XTi/400D, Rebel XS/1000D, Rebel XSi/450D Canon Flash Units: 580EX, 580EXII, 430EX, and 430EXII