[Apple MFi Certified] Skiva PowerFlow 1400mAh Slim Protective Battery Case with Built-in 30-pin connector for iPhone 4s & iPhone 4 - 1 Year Warranty [Model:P101] Apple MFi Certified: Built-in 30-pin connector contains an authorization chip issued by Apple which communicates with iPhone 4s / iPhone 4 to ensure 100% Compatibility with latest iOS 9. Powerful: 1400mAh Li-polymer iPhone 4s rechargeable battery can effectively provide 60%+ extra battery life for your iPhone 4s/4, which is equivalent to add 5+ hours talk time or 4+ hours web browsing time. Lightweight: Slim, impact resistant and easy to grip case that adds minimal bulk to your iPhone 4s/4. Now you can enjoy the backup and protection while still maintaining the slim form factor of your iPhone 4s/4. Designed buttons over iPhone's buttons to make them easy to press unlike most other cases which only have cutouts. High quality surface coating for anti-slip grip. PowerFlow is cetified by CE, FCC, and RoHS. Package includes: PowerFlow 1400mAh iPhone 4s/4 Battery Case, micro-USB to USB cable, User Manual, Warranty Card. It comes with 1 Year Hassle Free Warranty from Skiva, so you can purchase with confidence.