Full functions supported as the camera shutter switch (with halfway or complete pressing) * Functions as a timer remote and can be programmed to function as an interval met * Design for group, macro, long exposures, continuous, motion shooting, etc. * Energy saving design, can be use for long time * Compatible with:Canon EOS 20D,30D,40D,50D,5D,1D Mark II,1D Mark III,1Ds Mark II ,1Ds Mark III, 1D Mark IV, 5D Mark II,7D,