Opteka 650' Wireless Radio Remote Shutter Release Control for Canon EOS 1D, 1DS, 5D Mark I, 5D Mark II, 5D Mark III, 7D, 10D, 20D, 30D, 40D & 50D Digital SLR Cameras Range up to 200m (650ft.) without obstacles Can activate auto focus, release shutter, activate continuous drive mode or keep the shutter open for bulb photography as well Shutter button can half-press for focusing operation or full press for shutter release Batteries included for instant usage 1 Year Warranty