Adorama Wireless Radio Remote Release for Canon EOS 5D, 5D Mark II, 7D, 10D, 20D, 30D, 40D, 50D, 1DSM2 Omni-Directional Wireless RF Radio Remote Release Consists of Receiver which connects to camera's cable release socket and Sender Range of over 100 feet 16 channel Two position switch (one for focusing of camera and one for shutter release)