This Dot-Line Deluxe Digital Remote Shutter Release is a wireless radio transmitter and receiver set that is designed to work with the Canon 2.5mm connector as found on the EOS Rebel T1i, Rebel XS, Rebel XSi, Rebel Xti, & Rebel X digital cameras.
The remote possesses a maximum broadcast range of 100' under optimal conditions, and features a two-position switch, for focusing operation or shutter release. A direct line of sight is not required unlike optical or infra-red triggers. The "deluxe" version of this Dot Line remote features a digital display that indicates which one of the four radio channels is currently in use.
23A Button-Type Battery
RPS Lighting RSRT06EOS Deluxe Digital Wireless Shutter Release