This grip is specially designed for the Nikon D800/D800E DSLR cameras. It is equipped with an alternate shutter-release button, AF on button, multi selector, and main and sub-command dials for shooting in a vertical position. This power grip can hold one EN-EL15 rechargeable Li-ion battery, in addition to the cameras internal battery to extend your shooting time or can conveniently use eight AA batteries (alkaline, Ni-MH or lithium).