New function compared with YN600EX-RT is, YN685 has the two built-in Wireless Trigger systems, YN-622C system and RF-603 sytem, it can receive the wireless trigger singnal from YN-622C,YN-622C-TX, YN-560 IV, YN560-TX, RF-603 II, RF-605, so you can trigger more than two off camera flashs in manual mode, TTL mode, multi mode, and even remtoe control the each group' flash in flash mode, flash output, focal length and focal length synchronization
Wireless Slave Mode Remote Control mode: the remote control mode of YN685 is compatible with the master unit is YN622C-TX, the master unit is YN-622C, and the YN-622C has been enabled the remote control mode. Mix mode: the remote control mode of YN685 is compatible with the master unit is YN-622C, and the YN-622C has been enabled the mix mode It can receive the wireless trigger signal from YN-560 IV, YN560-TX, RF-605, RF-603 II Compaible with : 1), Hot shoe TTL mode: Canon 1Dx, 1Ds series, 1D series, 5DIII, 5DII, 5D, 7D, 7DII 70D, 60D, 50D, 40D, 30D, 20D, 700D, 750D 650D/T4i, 600D/T3i, 550D/T2i, 500D/T1i, 450D/Xsi, 400D/Xti, 350D,100D, 1100D, 1000D, 1200D 2), Wirelss TTL Slave mode: Canon 5DIII 7D 70D 60D 700D 650D 600D, Yongnuo ST-E2, Canon 580EX II Nikon SB-910, SB-900, SB-800, SB-700, Commander SU-800, Camera with CLS i-TTL system:D4, D3x, D3s, D3, D2x, D700, D300s, D300, D200, D7000, D90, D80 3), Wireless Manual ( RF-603 mode ) Sytem Yongnuo YN-560IV, YN560-TX, RF-605, RF-603 II ALL DSLR Standard Hot shoe Camera Package Included: 1YN685 Flash Speedlite for Canon Version 1Manual in English and Chinese 1Original box 1Mini Stand