The Canon BG-E11 Battery Grip is an optional battery grip. It has improved ergonomics and specifically designed for the Canon EOS 5D Mark III, 5DS and 5DS R. The BG-E11 also provides full vertical shooting controls, which can be independently turned on or off as the photographer needs to enhance camera handling, especially for shooting vertical pictures. It has a large number of operating controls as well: shutter button, Main Dial, multi-controller, AF point selection button, AE lock/FE lock button, AF start button, and multi-function button. It allows users to load a choice of one or two LP-E6 battery packs. This is especially useful when taking advantage of the camera's movie mode or Live View mode that uses more power. It has included battery magazine, so you can also run the camera off six AA batteries.