Yongnuo RF-602 2.4GHz 100M Wireless Remote Flash Transmitter with 2 Receivers for CANON PoweShot 650D, 600D300D.1D / 1DS, EO0S 5D Mark II / 5D / 50D / 40D / 30D / 20D / 10D 1.RF-602 C uses 2.4GHz channel and FSK modulation,15 selectabh frequency channels. 2.Flash sync speed is up to 1/250s. Maximum operating distance is up to 100 meters. 3.Support the flashgun wake-up function, (Wake up can only used in TTL Compatible flash) 4.Fire the flashgun through hot shoe part and fire the studio light through PC socket. 5. Nissin Di622 and Di866 can only support M mode. This item is not compatible with SB-400.