Wireless Remote Shutter Release for Canon 5d 7d 10d 20d 30d 5d Mark II C3R By Fancierstudio 16 Channels with Working Distance of 30 Meters One (1) Remote Shutter Receiver 16 channels One (1) Alkaline Battery 23A 12V User Manual Original Packaging Canon EOS 10D / 20D / 30D / 40D EOS 50D / 5D Mark II EOS 5D / 1D / 1Ds / 1D Mark II / 1D Mark II N /1Ds Mark II /1D Mark III / 1Ds Mark III