Product Description:   The release button reacts fast and fineAvoid Camera Vibration, Sharper PicturesTwo stage release button: Halfway pressing for auto-focus, complete pressing takes the pictureLock the button for long exposures or continuous shooting. Slide to lockAll electronic no batteries neededShutter Release Action:The release button can be pressed halfway or all the wayPress it halfway to activates auto-focusPress it completely to takes picturesPress and slide it to lock the shutter for bulb photographyCompatible With:For Canon EOS Digital SLR 1D, 1D Mark II, 1D Mark II N, 1D Mark III, 1Ds, 1Ds Mark II, 1Ds Mark III, 5D, 5D Mark II, 10D, 20D, 30D, 40D, 50D, D30, D60, D2000For Canon EOS Film SLR 1V 1VHS 3Kodak DSC-530Specifications:Type: Shutter ReleaseSize: 10 x 3 x 2 cmCable length: 91cmMaterial: soft coresNo batteries neededPackage included:1 x Shutter Release Cable RS-80N3