The YN-622C II E-TTL wireless flash trigger kit from Yongnuo includes 2 wireless flash transceiver units. Compatible with Canon E-TTL/E-TTL II cameras and with additional support for 622 and 560-RX communication protocols, this set will work well with many flash units. For use, one transceiver slides directly into the hot shoe and uses a 2.4 GHz frequency with a range of 328' to trigger remote flashes that are mounted on the other transceiver. The model has added a variety of functions, such as support for group ratios and multiple flashes. The transceivers also feature a hot shoe sync port and a computer port for attaching a flash unit or connecting to a strobe. When connected to a strobe via the computer sync port, a Super Sync function will allow photographers to achieve faster sync speeds than usual with their camera. Additionally, there are available TTL and manual flash modes for full creative control. It can also use 7 channels and 3 groups for easily and effectively setting up multiple flash units.

The YN-622C uses a series of LEDs to display settings and allow users to make adjustments. The device also has an AF assist beam for low-light conditions. Multiple sync modes are available for more specific needs or effects, including 1st and 2nd curtain sync. A high-speed sync function is available and will assist in intense lighting conditions and freezing motion with a maximum speed of 1/8000 second. Additionally, the transceivers operate on 2 AA batteries each.