What's included:
DSTE BL-3 Battery Chamber Cover x 1
Required when battery is teamed with MB-40 or MB-D10 battery pack;

Compatible with the following Battery Modle:
For Nikon EN-EL4A Battery

Compatible with  Camera Model: 
For Nikon D-SLR D3x  D3 D2Xs D2X D2Hs D2H Camera and MB-D10 MB-40 Battery Grip