This grip is specially designed for the Nikon D750 DSLR camera. It is equipped with an alternate shutter-release button, AE-L /AF-L button, main command dial, multi selector, and sub-command dial for comfortable access to the camera's controls while shooting in a vertical position. This power grip can hold one EN-EL15a rechargeable lithium-ion battery while a second is in the camera for more power and longer shooting times. Two Li-Ion battery trays are included. So you can pre-load the spare tray and change batteries ultra fast! An AA battery tray which uses 6 AA batteris in a pinch is also included.