This Dot-Line RS-RT04/EOS RF Remote Release is a wireless radio remote that works with the Canon EOS Rebel T1i, Rebel XS, Rebel XSi, Rebel XTi & Rebel X digital cameras. It consists of two parts: a receiver/trigger that connects to the camera's cable release socket, and a separate sender. The remote can have a range of up to 100' under optimal conditions, and it features a two-position switch, for focusing operation or shutter release.
Note! The receiver takes 2 "AAA" batteries (not included)