The Nikon MB-D11 Multi-Power Battery Pack is a battery grip for the D7000. The MB-D11 runs on either one EN-EL15 battery or six R6/AA-size alkaline/Ni-MH/lithium batteries to provide added stability with extended shooting potential. The magnesium alloy grip provides extra comfort and stability, making it easer to handhold your camera at lower shutter speeds. The MB-D11 comes with two battery trays—one holds an EN-EL15 rechargeable battery and the other holds 6 AA batteries. A holding case, contact cap and user's manual are also included.