YONGNUO YN622N-TX YN-622N-TX i-TTL Wireless Flash Controller for Nikon Digital SLR Camera +2 Free OOPSTEK Brand Premium Cleaning Cloths For Camera lenses,Screens,Glasses and any other delicate surface YN-622N-TX i-TTL wireless flash controller is for supporting the use of YN-622N i-TTL wireless flash trigger transceiver. Supporting mixed use of the A/B/C three groups of flashes with i-TTL, Manual flash, or Super sync flash mode Grouping flash mode: i-TTL/Manual flash/Super sync Support wireless shutter release function Shutter Sync: first curtain sync, second curtain sync and FP high-speed sync, the highest sync speed is 1/8000s