Compatible Cameras: EOS-1D X Mark II, 1D X, 1Ds Mark III, 1Ds Mark II, 1Ds, 1D Mark IV, 1D Mark III, 1D Mark II N, 1D Mark II, 1D, EOS D2000, 5D Mark III, 5DS, 5DS R, 5D Mark II, 5D, 6D, 7D Mark II, 7D, 50D, 40D, 30D, 20D, 10D, D60, D30, EOS-1V, EOS-3 | Control autofocus and shutter triggering, capture images without shaking camera | Ideal for bulb exposures, super telephoto shots and macro photography | Handy for taking pictures of subjects that are difficult to approach | 70cm long camera connection cord. No battery required - powered by camera