Yongnuo YN-622C II ETTL wireless flash trigger Transceiver for Canon with WINGONEER Diffuser The quick lock design, you can fasten the hot shoe of this flash trigger with your camera or flash. It supports 622C communication mode ( YN-622C and YN-622C-TX) and ( RF-605C, RF-603 II and YN560-TX ). TTL mode, you can use YN-622C II, YN-622C, Canon version together, and when you use it with YN-622C-TX, it can be used as receiver. Manual mode,you can use YN-560TX, RF-603 II, RF-605C as transmitter, and use YN-622C II as receiver. It supports USB Firmware upgraded.