Movo Photo FF20 USB Focus Controller for Canon EOS Digital Rebel T1i, T2i, T3, T3i, T4i, 60D, 70D, 7D, 5D MkII/III, and 1D Mk IV DSLR Cameras Remotely controls focus, digital zoom, LiveView and video start/stop Works on the Canon EOS Digital Rebel T1i, T2i, T3, T3i, T4i, 60D, 70D, 7D, 5D MkII/III, and 1D Mk IV DSLR Cameras Manual focusing wheel Adjustable focus speed Powered by 2 "AA" batteries