The BP-5D MKII is a crucial accessory for any serious users of the Canon 5D Mark II camera. With this grip attached, your camera's battery life will double. The grip offers a shutter release button, main dial, AE/FE lock, AF point selection, and a comfortable grip for use when shooting vertically. The grip will hold either two LP-E6 battery packs or six AA batteries. Be sure to add this grip to your camera gear today to provide extra power to your camera on those long shoot days!