The Precision BG-N6 Battery Grip for Nikon D5100 & D5200 Camera provides the power you need for the Nikon D5100 or D5200 SLR digital camera with up to two EN-EL14 rechargeable, high-capacity batteries. In addition, the battery pack provides a vertical shutter release that makes holding the camera in the vertical orientation as easy and secure as in the horizontal position. This is accomplished by connecting the included external cable from the socket on the grip to the shutter release socket on the camera.