The Precision BG-N2 is a battery grip designed for use specifically with the Nikon D80 and D90 digital SLR cameras. It accepts up to 2 EN-EL3e batteries to effectively double the camera's battery life. The included AA battery holder allows you to use 6 AA batteries for added convenience. The BG-N2 offers an alternate shutter release button, main and sub command dials, and an AE-L/AF-L button to facilitate shooting in a vertical orientation.