Shutter Release Action: The release button can be pressed halfway or all the way Press it halfway to activates auto-focus Press it completely to takes pictures Press and slide it to lock the shutter for bulb photographyCompatible With: 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， D2000 Canon EOS Film SLR 1V 1VHS 3 Kodak DSC-530Specifications: Model: RS-80N3 Type: Shutter Release Size: 10 x 3 x 2 cm Cable length: 91cm Material: High-quality soft cores No batteries neededPackage included: 1 x Shutter Release Cable RS-80N3