The Green Extreme Professional Power Battery Grip & Battery Kit for the Sony A7R IV & A9 II MSLR Cameras is an essential accessory with excellent ergonomics, designed for the Sony A7R IV & A9 II MSLRs using NP-FZ100 battery modules. The convenient kit includes 2 Green Extreme NP-FZ100 batteries for twice the power and smooth operation. It all starts with intelligent links to camera functions. The grip matches the design and feel of your camera while doubling the battery power with a twin cell chamber that can load a choice of one or two battery packs. Your uptime will be significantly better compared to using a single NP-FZ100 pack. The performance is remarkable, delivering consistent six frames per second while on the high-speed continuous shooting mode. The grip has smarts, utilizing inserted batteries in a sequence of power reserve while displaying the status in real-time. The non-slip, rubberized grip offers the perfect balance in any direction with full vertical shooting controls. That feature is independently turned on or off as the photographer needs to enhance camera handling, especially for shooting vertical pictures - not vert-videos, please. The grip has generous 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. The base of the grip has a standard ¼" -20 tripod socket and a hand strap mount. Your camera's original battery do