YONGNUO YN-622C Kit YN-622C-TX Bundle With YN-622C Single Transceiver Supporting mixed use of the A/B/C three groups of flashes with E-TTL, Manual flash, or Super sync flash mode High-speed Synchronous up to 1/8000s and Remote Control Function Support simulate (modeling) flash, red-eye reduction flash Support the flash zooming (auto) and exposure compensation, flash value lock function(FVL) Support the basic flash trigger (max sync speed is 1/250s) of standard hot shoe