Yongnuo YN510EX Flash Speedlite for Canon and Nikon Wireless Flash System, PC Port, Electric Zooming Connects the RF-603 transceiver to your camera to work as a wireless shutter release control to trigger your camera Compatible with Canon 1D/5D/7D/50D/40D/30D/20D/10D Includes (1) C3 shutter release cord Transceivers NOT included