The Bower RCWN3R Wireless Shutter Release Set is an extended range wireless system designed for professional and advanced amateur users of the Nikon D90. The set consist of the receiver and the shutter release transmitter.
The remote system is very handy for taking pictures of subjects that are difficult to approach, or to minimize vibration for close-ups and time exposure. The remote fires the camera from a maximum distance of 90' (27.43m). Sixteen transmission channels are available to prevent interference between other cameras using wireless remotes.
Note: The receiver takes 2 "AAA" batteries (not included)