Yongnuo RF-603 2.4GHz Wireless Flash Trigger/Wireless Shutter Release Transceiver Kit for Canon Rebel 60D/350D/450D/500D/550D/600D/650D/700D Series (Discontinued by Manufacturer) Works as a wireless shutter release control to trigger your camera Transceiver System - works as a wireless flash trigger and receiver Each RF-603 is designed to work as trigger and as receiver Compatible with Canon Rebel 300D/350D/400D/450D/500D/550D/1000D Series cameras for shutter release control Includes (2) RF-603 transeivers (1) C1 shutter release cord