The WR-1 can be used for a variety of functions, such as a remote trigger for long exposures or interval and as a way to sync the shutter of multiple cameras. Another feature is using a release delay to stagger the triggering of the camera. On select cameras users will be able to view and change camera settings as well. Additionally, it is either powered by the camera or 2 AA batteries.
Nikon WR-1 Specs