Apple Smart - Battery case back cover for mobile phone - silicone, elastomer - charcoal grey - for iPhone 6, 6s

The Smart Battery Case is engineered specifically for iPhone 6s and iPhone 6 to give you even longer battery life and protection. The soft microfiber lining on the inside helps protect your iPhone, while the soft elastomer hinge design makes it easy to put the case on and take it off again. On the outside, the silky, soft-touch finish of the silicone exterior feels great in your hand.
Charge your iPhone and battery case simultaneously for increased talk time up to 25 hours, Internet use up to 18 hours on LTE, and even longer audio and video playback. With the Smart Battery Case on, the intelligent battery status is displayed on the iPhone Lock screen and in Notification Center, so you know exactly how much charge you have left.
The battery case supports Lightning accessories, such as the Lightning to USB Cable (included with your iPhone) and works with the iPhone Lightning Dock (sold separately).