uNu Power DX PLUS External Protective Battery Case for iPhone 4S and 4 2400mAh - MFI Apple Certified (Matte Black, Fits All Models iPhone 4S/4)

Extended Capacity battery built inside of a light-weight, soft-touch, durable shell. It is designed to fit iPhone 4S and iPhone 4 The same protection grade as the original DX case made by uNu. 40% more juice, 2x faster charging speed. And Apple Made for iPhone certified products. Adds up to 10 hours of talk time (up to 20 on 2G) and 9 hours of Web browsing on 3G (up to 14 on Wi-Fi) to your iPhone Integrated LED power guage indicator on the back 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 DX plus battery case by using the included USB cable