iPhone 6 / 6s Battery Case, Anker Ultra Slim Extended Battery Case for iPhone 6 / 6s (4.7 inch) with 2850mAh Capacity / 120% Extra Battery [Apple MFi Certified] (Black) Media's #1: Recommended by Time Magazine and The Wall Street Journal. The '#1 iPhone 6 battery case' according to The Wirecutter. 120% Longer Battery Life: 2850mAh capacity provides an extra 60 hours audio, 17 hours 3G talktime, 13 hours video, 12 hours web browsing or 3 hours 3D gaming to your iPhone 6 / 6s. Incredibly Slim: More than double your iPhone's battery life without doubling its size (adds only 0.23in & 2.9oz). Deluxe matte exterior provides secure grip. Apple MFi Certified: Complete charge and sync compatibility with the iPhone 6 / 6s. Transfer data or charge phone using the included Micro USB cable (no need to remove battery case). What You Get: Anker Ultra Slim Battery Case for iPhone 6 / 6s, Micro USB cable, audio jack extender, welcome guide, our worry-free 18-month warranty and friendly customer service.