Vello RS-C2II Wired Remote Switch for Canon DSLRs w/3-Pin Connection - Canon EOS: 10D, 20D, 30D, 40D, 50D, 5D, 5D Mark II, 5D Mark III, 6D, 7D, 1D, 1Ds, 1DS Mark II, 1Ds III, 1Ds IV and 1D X Control Autofocus and Shutter Triggering | Capture Images without Camera Shake Ideal for Taking Long Exposures | Use for Continuous or Single Exposures No Battery Required-Powered by Camera | Larger, More Comfortable Form Factor 1-Year Limited Warranty