Brand new! Never used! The box was opened and the contents were taken out for the sole purpose of photographing it for this listing, it was promptly put back in the box after it was done being photographed! “The Nikon MS-D12 AA Battery Holder for MB-D12 Multi-Power Battery Pack allows users of the Nikon D800, D800E, and D810 digital cameras with the MB-D12 Multi-Power Battery Pack to use 8 AA batteries instead of the Nikon EN-EL15 lithium-ion battery. This is especially useful when shooting in cold weather. Also, you can keep and additional MS-D12 AA battery holder pre-loaded, so that you can quickly swap out battery sets.” Does not include any batteries! It is just the holder! It does come with a carrying case for the holder though! The box measures approximately 6 x 3.25 x 2 inches. Weighs 3.0 oz, without shipping materials!