Battery Pack, Provides Added Stability with Extended Shooting Potential Product descriptions: The YONGNUO MK-40D multi-power battery pack holds 2 EN-EL3e Lithium-ion rechageable batteries, effectively doubling your total shooting time Can also hold AA battery holder (included), so users can use AA batteries as power backup The MK-40D multi-power battery pack provides an AF-on button, vertical firing release with lock, and front and rear command dialsProduct details: Brand: YONGNUO Model: MK-40D Dimensions: 142.7W x 110.5h x 75.7gl Net weight: 325gFeatures: Runs on either one or two EN-EL3e batteries or six AA-size batteries Works with AA-size alkaline, Nickel Metal Hydride (Ni-MH), lithium, and nickel-manganese batteries Provides added stability with extended shooting potential

Battery Pack