Wemacro Shutter Release Cables have a 3.5mm Stereo plug on the Wemacro end and a Camera Specific connector on the camera end.

The Wemacro 3N shutter release cable is suitable for use with Canon:

EOS6D, 7D, 50D, 40D, 30D, 5D, 20D, 10D, 5D Mark II, 5D Mark III, 1D X, 1D Mark IV,1Ds Mark III, 1D Mark III, 1D Mark II N, 1Ds Mark II, 1D Mark II etc.