Wireless flash trigger set for your Canon camera. Use the flash wirelessly as if it was mounted on the camera - with all automatic functions and high-speed flash functions. The TTL communication between TTL flash and camera is transmitted via 2.4GHz radio. With 30 channels and a separate group control (A / B / C) you can buy several flash units, each equipped with a separate receiver and trigger them over a maximum distance of 100 meters.