Mophie Juice Pack Plus Case and Rechargeable Battery for iPhone 4 & 4S - Black (Certified Refurbished) This Certified Refurbished product is tested and certified by the manufacturer or by a third-party refurbisher to look & work like new, with limited to no signs of wear. The refurbishing process includes functionality testing, inspection, reconditioning and repackaging. The product ships with all relevant accessories, a minimum 90-day warranty & may arrive in a generic white or brown box.Only select sellers who maintain a high performance bar may offer Certified Refurbished products on Amazon. Rechargeable smart battery concealed inside of a light-weight, soft-touch, 2-tone matellic case; made for iPhone 4 & 4S Adds up to 8 hours of talk time (up to 16 on 2G) and 7 hours of Web browsing on 3G (up to 11 on Wi-Fi) to your iPhone Rechargeable smart battery concealed inside of a light-weight, soft-touch, 2-tone matellic case; made for iPhone 4 & 4S Integrated LED status indicator on the bottom tells you exactly how much juice is left at the push of a button