YONGNUO RF-603C Wireless Flash Trigger Remote Control Transceiver for Canon Rebel 300D/350D/400D/450D/500D/550D/1000D Series Works as a wireless shutter release control to trigger your camera;Transceiver System - works as a wireless flash trigger and receiver Compatible with Canon Rebel 300D/350D/400D/450D/500D/550D/1000D Series cameras for shutter release control Color: Black; Size: 3" device w/ 10" expandable cord; Batteries: 2 x AAA (NOT included) Package Contents: 2 x RF-603 transceivers; 1 x C1 shutter release cord