Vivitar PG-5DMIII Deluxe Power Grip for Canon EOS 5D Mark III Vivitar PG-5DMIII Deluxe Power Grip for Canon EOS 5D Mark III - AA Battery Tray - Contact Cover - Vivitar 3 Year Limited Warranty Provides comfortable and secure handling when shooting in the vertical position, including a secondary shutter release button, ON/OFF button, AF point selection, AE lock/FE lock/Index/Reduce button and main dial Accepts up to 2 LP-E6 batteries to effectively double the camera's battery life The included AA battery holder allows you to use 6 AA batteries for added convenience Features anti-slip rubber gripping and a securely locking battery chamber door