Vertax D11 is a battery grip for Nikon D7000 camera which can be installed with one battery of EN-EL15 or six batteries of AA/LR6. A D11 grip equals to an extra battery that can double the power. It is indispensable for shooting outside. The battery grip is equipped with multiple buttons which make the shooting easier. The quality is comparable with the one in the original factory with the super workmanship and performance.