Opteka RFT-40 Remote Shutter Release and Wireless Flash/Light Trigger Combo Fully dedicated for the Nikon D1X, D2X, D3, D3X, D3S, D200, D300, D300S & D700 Digital SLR Cameras Wireless Shutter Release Mode (Fig 1-A) remotely triggers your camera shutter from up to 650' away. Expandable up to four cameras with the purchase of additional receivers Wireless Flash Trigger Mode (Fig 2-A) remotely triggers an external flash. Can trigger up to four flashes simultaneously with the purchase of additional receivers Wireless Studio Light Trigger (Fig 3-A) remotely triggers an studio light. Can trigger up to four studio lights simultaneously with the purchase of additional receivers 1 Year Warranty