Mophie Juice Pack Air Case and Rechargeable Battery for iPhone 4 - White (Certified Refurbished) This Certified Refurbished product is factory refurbished, shows limited or no wear, and includes all original accessories plus a 90 day warranty Rechargeable smart battery concealed inside of a low-profile, light-weight, soft-touch, 2-tone matellic case; made for iPhone 4 Compatibility with both Verizon & AT&T iPhone 4 Protective form-fitting case with an ultra-thin, light-weight, low-profile design Adds up to 6 hours of talk time (up to 12 on 2G) and 5 hours of Web browsing on 3G (up to 9 on Wi-Fi) to your iPhone