YONGNUO YN622N-TX Wireless TTL Flash Controller Transmitter with LCD Display working with HSS& Full Function for Nikon Wireless TTL Flash Controller Transmitter with LCD Display working with HSS& Full Function for Nikon High-speed Synchronous and Remote Control Function, Individual 1/3rd stop Manual Power and FEC adjustment Max Sync. Speed: 1/8000s, improved Stability and Transmission Speed. Remote Flash Zoom in 3 groups, and Auto Zoom Mix TTL, Remote Manual and SuperSync Manual Timing Adjustment by Group Syne mode ( 1st-curtain, 2nd-curtain, Hi-speed sync ( Auto FP ) )