Canon LC-5 Wireless Controller for select EOS Digital SLR Cameras Easily capture rock-solid macro shots and close-ups from up to 330 feet away One-shot release mode pre-focuses camera and waits for subjects to cross into range Attaches easily to camera's accessory shoe Powered by four AA-sized batteries Compatible with Canon EOS 30D, 20D, 10D, 5D, EOS-1D, EOS-1DS, EOS-1D Mark II, EOS-1DS Mark II, EOS-1D Mark III