mophie juice pack Air for iPhone 4/4s (1,700mAh) - White Compatibility with both Verizon & AT&T iPhone 4 Rechargeable smart battery concealed inside of a low-profile, light-weight, soft-touch, 2-tone matellic case; made for iPhone 4 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 Protective form-fitting case with an ultra-thin, light-weight, low-profile design Integrated LED status indicator on the bottom tells you exactly how much juice is left at the push of a button Charge and sync your iPhone to iTunes without removing it from the juice pack air by using the included USB cable