The Phottix Premium Series BG-D800 Grip for the Nikon D800 features AF/On button, command dials, vertical shutter button and multifunction controller. The BG-D800 holds 8 AA batteries or 1 EL-EL15 battery in the included trays. The BG-D800 also provides a comfortable vertical grip with an additional shutter release button and a scroll wheel for easy access to the camera functions when shooting vertically. The grip also incorporates a tripod socket.