Anker PowerCore Case for iPhone 7 (4.7 inch), iPhone 7 Charger Case, 95% Extra Battery 2750mAh [Apple MFi Certified] (Black) The Anker Advantage: Join the 20 million+ powered by America's leading USB charging brand. Hours of Power: Instantly add almost 95% extra battery. That's 13 hours of surfing, 10 hours of music or 8 hours of video. Superior Materials: Soft internal lining and tactile silicone exterior provide a premium finish and make phone installation effortless. Slimline Design: Sleek and pocket-friendly case doubles your iPhone's power without doubling its size. What You Get: PowerCore Case for iPhone, Micro USB charging cable, Welcome Guide, our worry-free 18-month warranty and friendly customer service.