It is Replacement Nikon MB-D12. This Multi-Power Battery Pack for Nikon D800/D800E is used with Nikon D800/D800E Camera, has the same functions as the original Nikon grip MB-D12. It can hold one EN-EL15 rechargeable battery or eight AA batteries (alkaline, Ni-MH, or lithium) - effectively doubling your shooting capacity. This battery grip includes a shutter-release button for vertical shoots and the AF-ON button, Multi selector, main command dials and subcommand dials to increase its functions, used more conveniently. Specification: Compatible with: Nikon D800/D800E Camera Dimension: 155 x 54 x 77mm Weight: 282g Color: BlackPackage included:1x Battery Grip for Nikon D800/D800E,1x Battery Holder ( Battery is NOT included ) 1x User Manual