Opteka 650' Wireless Radio Remote Release Control for Nikon D1X/D2x/D3/D3X/D3S/D200/D300/D300S/D700 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