TheCanon BG-E21 Battery Gripfor the 6D Mark II is designed to improve handling and extend battery life. The BG-E21 holds twoLP-E6N battery packs, or can use the optional AC Adapter Kit ACK-E6 for extended shooting time. It features a variety of controls such as a shutter button, main dial, multi-controller, AF point selection button, AE/FE lock button, AF start button, and multifunction button making it ideal for vertical shooting. With an additional shutter button, the BG-E21 allows for vertical orientation shooting, for a quicker and streamlined photography experience.