Targus Digital TG-BGD40 Battery Grip for Nikon D40/D40x/D60 Functions both as a high-capacity battery pack and vertical grip Enhances camera stability during vertical shooting and includes a convenient shutter release button Extends shooting capacity by accepting two ENEL9 battery packs Optional battery magazine holds 6 AA batteries for emergency power Compatible with Nikon D40, D40x, D60 digital SLR Cameras