Yongnuo YN-622C Wireless ETTL Flash Trigger Receiver Transmitter Transceiver Compatible flash mode: E-TTL (II)/ Manual/ Multi. Compatible Shutter sync: 1st curtain, 2nd curtain, high speed sync (HSS/FP), max 1/8000s sync speed. Control remote flash using camera's flash control menu screen(Remote Control Mode). Support E-TTL / Manual/ Multi flash mode mix using(Mix Control Mode). Flash on hot-shoe of transmitter supports ETTL. Support Flash Exposure Compensation(FEC). Support Flash Exposure Bracketing.(FEB) Support Flash Exposure Lock.(FEL) Support modeling Flash. Support E-TTL group ratio (ALL/ A:B/ A:B C). Support Manual/Multi group (ALL/ A:B/ A:B:C). Support flash zooming (auto, manual). Support AF assist beam emitter(AF Lamp). Support PC port triggering strobe flashes and support 1st, 2nd curtain/HSS(Super Sync). Support LCD Live view triggering. Support high-speed continuous shooting trigger. Settings saved automatically. Compatible with ALL YongNuo/ Canon EXII series flashes. Support single-contact of camera & flash triggering.(max sync speed is 1/250s)