Control multiple flashes equipped with the YN-622C E-TTL II transceiver with the YN-622C-TX E-TTL II Wireless Flash Controller from Yongnuo. Compatible with Canon E-TTL II cameras, this controller slides directly into the hot shoe and utilizes a 2.4 GHz frequency with a range of 328' to trigger the remote flashes. The controller also has TTL, manual, and multi flash modes available for full creative control. Additionally, it can utilize 7 channels and 3 groups for setting up multiple flash units easily and efficiently.