Features: Consists of 2 same transceivers, both of which can be a receiver as well as as transmitter. Can also buy additional transceiver(s) to trigger 3 or more flashed at the same time. Support the flash installed on transmitter(on-top flash) and supports i-TTL function master control mode. Supports 622 and 603-RX communication mode,can receive the triggering signal of YN-560TX/RF605(603 mode)/RF603(II) series products. Compatible i-TTL/Manual/Multi flash modes, and support i-TTL/Manual/Multi flash mode mix using(mix control mode). Support remote set the parameters of flash through the transceiver(remote control mode). Compatible Shutter Sync: front-curtain, rear-curtain, high speed sync(HSS/FP), max 1/8000s sync speed. Support FEC, FVL, BKT function. Support modeling flash and red-eye reduction flash. Support flash zooming (auto). Built-in AF assist beam emitter(AF Lamp). Support PC port triggering strobe flashes and support front-curtain, rear-curtain, high speed sync(HSS/FP). Settings saved automatically. Support single-contact of camera flash triggering.(max sync speed is 1/250s) Support USB firmware upgrade. Quick lock design, easy to use. Compatible camera list: for Nikon D70, D70S, D80, D90, D200, D300, D300S, D600series, D700, D800series, D3000series, D5000series, D7000series Compatible i-TTL flash list: for YongNuo YN 465, YN467, YN468, YN565, YN568 (for Nikon series) for Nikon SB-600, SB-700, SB-800, SB-900, SB-910 List of the master unit that supports the master control mode on the transmitter: SB-700, SB-900, SB-910 The following functions refer to the camera and the flash: FVL, BKT function Modeling flash Red-eye reduction flash Zoom