ULTIMAXX BG-E21 Battery Grip for Canon 6D Mark II Short Description Compatibility: Tailored for Canon 6D Mark II DSLR Camera, With same function as original Canon battery grip BG-E21 TRIPOD SOCKET: Equipped with a tripod socket on the bottom of the grip so that the battery grip can be mounted on a tripod MULTI-CONTORL BUTTONS: Equipped with shutter button, tripod socket, exposure lock button, flash lock button, and auto-focus point selection button on the underside of your camera for convenient and improved operability Double Power: Place 1 or 2 LP-E6/LP-E6N Lithium Batteries, equivalent to adding an equivalent battery (not include battery)