JJC MA-A Remote switch (Compatible RS-80N3) Features: 1) Two stage release button: halfway pressing for auto focus 2) Complete pressing takes the picture 3) Lock the button 4) For long exposures or continuous shooting 5) Fully compatible with: a. Canon EOS 5D, 1D, 1D Mark II, 1Ds, 1Ds Mark II b. Canon EOS 20D, 10D, D60, D30 c. Canon EOS 1V, EOS 3, EOS D2000 d. Canon EOS 30D e. 100% compatible with RS-80N3