YONGNUO YN685 E-TTL HSS 1/8000s GN60 2.4G Wireless Flash Speedlite Speedlight + YN-622C-TX Flash Transmitter for Canon DSLR Cameras Completely compatible with YONGNUO 622C and 603 wireless system: YN685 supports respectively receiving wireless triggering signal from YN622C, YN622C-TX, YN560IV, YN560-TX, RF605, RF603II and RF603. 2.4G wireless speedlite with high guide number of GN60. The maximum sync speed is up to 1/8000s. It transmits all the settings in External Flash Menu of your camera to remote flash(es), you can control flash(es) through camera menu.