2.4Ghz Wireless Flash Trigger/Wireless Shutter Release Transceiver Kit (WS-603C for Canon) Uses global free FSK 2.4GHz wireless channel which can be suitable in many countries With FSK, can guarantee speed, distance and stability Within capacious areas, the remote control distance may reach over 100m. Consists of 2 same transceivers, both of which can be a receiver as well as as transmitter Can trigger 2 flashes at the same time with one set(one on the camera, and one off-camera flashgun) Can also buy additional transceiver(s) to trigger 3 or more flashed at the same time Compatible with: for CANON 650D 600D 60D 550D 500D 1000D 450D 400D 350D 300D, etc. Note: This flash trigger do not support TTL