JYC Digital Cabled Remote Control MC Series for Canon High End SLR - Mod. MC-C3 Camera Cable Remote Control for Canon Top End SLR: OS1V, EOS3, EOS1D, 1DS, 1DSMK?, 1DSMK?, EOSD30, EOS 10D, 20D, 30D, 40D, 50D, 5D, 5D?, 7D, EOSD60, 5D Mark III etc. Dimensions: Approximately 155 x 40 x 18 mm (6.1 x 1.6 x 0.7 in), excluding projections Weight Approximately 105g (3.7oz), excluding ferrite core. Length of cord Approximately 850mm (33.5in). Power source Two AAA 1.5V LR03 alkaline batteries