Fires your SLR from up to 328 feet away with radio frequency signals for reliable remote control, even when you're not within direct line-of-sight of your camera. This transmitter and receiver set is excellent for portrait, wedding, wildlife, surveillance and other types of photography that require dependable triggering of remotely positioned cameras. The receiver mounts on the camera hot shoe and includes 10" long cables to connect to camera remote outlet. The hand-held transmitter has a button for activating the autofocus/auto-exposure system and a second button for triggering the camera shutter. Includes batteries [(1) CR2 for receiver, 23A 12V for transmitter.] 101025 is compatible with Nikon D70s, D80, D90, D5000, D3, D700, D300, D200, D100, and all D1, D2 versions.