Nubee Rechargeable External Battery Case for iPhone 4 & 4S Retail Packaging 2700mAh - Green (Verizon, AT&T and Sprint) Brand new and good quality iPhone 4S/4 external battery case, The case is made of Aluminum alloy, very smooth and durable. Adds up to 11.5 hours of talk time (up to 25 on 2G) and 11.5 hours of Web browsing on 3G (up to 16 on Wi-Fi) to your iPhone Integrated LED status indicator on the bottom tells you exactly how much Case is left at the push of a button Not only used as a power bank to charger your iPhone 4S/4, but a good case to protect your phone from scratches and other minor damages Ideal for long distance travel or business trip