Today we would like to recommend this YN622N-TX i-TTL Wireless Flash Controller to you. It adopts flexible LCD menu control， supporting mixed use of the A/B/C three groups of flashes using i-TTL， manual， or super sync flash mode， can be adjusted the exposure compensation or flash output of each group. It features Super Sync (SS) time delay adjustment and allows higher x-sync speed than the camera. Besides， it supports setting different focal length(zoom)of the three groups of flash， supporting seven wireless channels and A / B / C three groups and USB firmware upgrade. Altogether， this controller is for supporting the use of YN622N-TX i-TTL wireless flash trigger transceiver.                                    Features            LCD screen display， multi-buttons quick operationThe firmware can be upgraded through the USB interfaceSupport wireless shutter release functionThe focal length(zoom)of the A / B / C three groups of flash can be adjusted separatelyEquipped with the AF focus assist light (can be disabled)Settings saved automaticallyThe flash sync signal can be input through the PC port                                                            Specifications             Wireless Frequency System      FSK 2.4GHz     <br> Operating Distance     100m    <br> MAX Shutter Sync Speed     1/8000 s    <br> Shutter Interface     2.5mm socket    <br> Wireless Channel     7 channels    <br> Standby Time     120 h    <br> Flash Mode     i-TTL， Manual Flash， Super Sync    <br> Battery     2 x AA Battery9. Sync Mode: Front-curtain Sync， Rear-curtain Sync， Hi-speed Sync (Auto FP)10. Groups: 3 Groups (A/B/C)    <br> Dimensions     ( 3.5 x 2.09 x 1.54 )" / ( 8.9 x 5.3 x 3.9 )cm (L x W x H)    <br> Weight     6.24 oz / 177 g    <br> Compatible with     Nikon D70/ D70s/ D80/ D90/ D200/ D300/ D300S/ D600/ D700/ D800， D3000 series， D5000 series， D7000 series    <br>                                                             Package Includes            1 x YN622N-TX i-TTL Wireless Flash Controller1 x Manual1 x LS-2.5/N1 Shutter Connecting Cable1 x LS-2.5/N3 Shutter Connecting Cable