RS-80N3 Remote Switch Shutter Release cord for Canon EOS D30, D60, 5D, 6D, 7D, 10D, 20D, 20Da, 30D, 40D, 50D, EOS 5D Mark III Digital SLR Camera Package includes: Remote Switch Shutter Release cord x 1 Two stage release button: Halfway pressing for autofocus,complete pressing takes the picture. Lock the button for long exposures or continuous shooting. The release button reacts fast and fine.