The Phottox Premium Series BG-D700 Vertical Grip/Battery Holder for Nikon D300 and D700 digital cameras, incorporates the same functions as the Nikon MB-D10 Grip, with AF/On button, vertical shutter button, vertical command dial. The Phottix BG-D700 Multi-Power Battery Grip allows the Nikon D300/D700 to be powered by two EN-EL3e batteries simultaneously - one in the camera body and one in the BG-D700 - effectively doubling you shooting capacity. The BG-D700 also provides a comfortable vertical grip with an additional shutter release and scroll wheel for easy access to the camera functions when shooting vertically. The included BL-3 battery tray is only for the Phottix BG-D700 and allow the use of a EN-E4/EN-EL4a battery to used. The original Nikon made BL-3 can not be used with this grip. The grip can also be powered by 8 AA batteries.