This precision Shutter Release allows the Nikon D90 DSLR camera shutter to be released from a distance helping to reduce camera shake and allow the photographer to be at a distance form the camera. It features a three position switch. The first position focuses the lens and sets the meter. The second position releases the shutter. The last position locks the release for long timed exposures and continuous video operation. All electronic, just plug-in and use. Cord is 35” long.