The uNu DX-Lite is made with an extra-slim profile so that you can take it along with you with ease. This case has the powerful capacity of 1500mah and it is able to supply 80% of your iPhone battery life. which cantranslate into 6 hours added of talk time, 30 hours of music playback, or 240 hours of stand-by time. There is also an option to personalize your phone with an assortment of exchangeable color bumpers to choose from. The case also has the following built-in functions: charging switch, LED battery level indicator, charge & sync through the case, headphone jack cutout, function button cutouts. No need to remove the case in order to use all the phones functions. 1 year warranty.
(MFI Certified, Stylish Bumper Style Case with 1500mAh Built-in Battery Fits All models of Apple iPhone 4S and iPhone 4)