Milkbox 2000mAh black battery case for Iphone 4/4s Super Fast rechargeable smart battery case, soft-touch, with Metallic edge - 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 4 Charge and sync your iPhone to iTunes without removing it from the battery case by using the included mUSB cable Integrated LED status indicator on the bottom tells you exactly how much juice is left at the push of a button Speedy charging. Compatible to the new i-phone charging standard. 1000mA 5V instead of 500mA 5V. Half the charging time.