iPhone 11 Pro Max Smart Battery Case Brand new; has not been used still in box. Engineered for iPhone 11 Pro Max, the Smart Battery Case gives you even longer battery life while offering great protection. Inside, a soft microfiber lining helps protect your iPhone. And on the outside, the silky, soft-touch finish of the silicone exterior feels great in your hand. A soft elastomer hinge design makes it easy to put the case on and take it off.