Vivitar Wired Remote Shutter Release for Canon EOS 5D/7D/40D/50D DSLR Cameras Allow picture taking while away from the camera Control autofocus, shutter release speed and aperture setting No battery required - powered by camera Enables long exposures and continuous shooting Compatibility: Canon EOS: 1v/3/1D/1DS/5D Mark II / 1DS Mark III / 1D Mark IV/ 7D/10D/20D/30D/40D/50D