Features and Functions: Omni-Directional Range of over 100 feet 16 Channel LED Indicators Two position switch for focusing and release Description: This unit allows the photographer to be away from the camera, yet take pictures, even when there are obstacles (walls, etc.) between him or her and the camera. This wireless shutter release activates the auto focus and the automatic meter systems of the camera and then trips the shutter just as if the photographer was holding the camera and squeezing the shutter release button. The transmitter has a two position button. Depressing the button half way activates the auto focus and the meter, depressing the rest of the way fires the shutter, just like the camera's shutter release. An LED indicates that the auto focus and meter have been activated and then that the shutter has fired. Because there can be other photographers in the area or wireless networks, the photographer can choose one of 16 channels to work with. Range is up to 100 feet. The transmitter is powered by one 23GA battery which is included. The receiver is powered by 2 "AAA" batteries. COMPATIBLE WITH: Nikon D90 Nikon D5000