The Vivitar Battery Grip is designed for use with the Panasonic DMC-G85MK Camera and uses one DMW-BLC12 battery (not included) which provides more power, and extended shooting time. Conveniently, the battery power indicator is displayed on the camera LCD screen, so that you won't have to worry about running out of power unexpectedly. Mounted on the bottom of the camera, the grip sports a vertical shutter button just perfect for portrait photography and includes an AE/AF lock button ensuring consistently great shots.