Neewer CellsII-C High Sync Speed Wireless Transceiver Studio Flash Strobe Trigger Transimitter Receiver for Canon EOS Series Cameras, Witstro series Speedlite, Neewer TT520 TT560 TT680 TT850 Flash All-in-one be a wireless transmitter and a receiver for studio flash/Speedlite Flash, and camera shutter.(Transfer between Receiver and Transmitter just Switch TX and RX) Featuring multi-channel triggering, stable signal transmission, and sensitive reaction, it gives photographers unparalleled flexibility and control over their strobist setups. The transceiver applies to hotshoe-mounted Canon EOS series cameras. With Cells II, high speed synchronization is available for most of studio flashes in the market. The max flash synchronization speed is up to 1/8000s. Speedlites and high-speed studio flashes can also achieve high speed synchronization when used with specific models of Canon EOS cameras. Not all camera-flash combinations can achieve high speed synchronization. Max Sync Speed in Different Camera-Flash Combinations. *: 1/8000s is achievable when the camera has a max camera shutter speed of 1/8000s. 1/8000s is not achievable because some models of Canon EOS cameras has a max camera shutter speed of only 1/4000s;High-speed studio flashes refer to those having a flash duration shorter than 1/2000s and adopting IGBT technology. All Neewer Products lineup are available in our amazon site including TT850, TT860C/N and Studio Strobe Flash and have suitable kit for different levels Photographers