uNu DX Lite iPhone 4S Battery Case / iPhone 4 Battery Case - Black / Crystal Black (MFI Certified, Stylish Bumper Style Case with 1500mAh Built-in Battery Fits All models of Apple iPhone 4S and iPhone 4) The uNu DX-Lite is designed to go wherever you need it to. With an extra-slim profile the DX-Lite can fit in a pocket, purse or backpack with ease. Charging your phone has never been so convenient! This powerful case has the capacity of 1500mah and it is able to supply 80% of your iPhone battery life. In fact, the DX-Lite has the power to add 6 hours of talk time, 30 hours of music playback, and a huge 240 hours of stand-by time. Nothing personalizes a phone better than customization. With an assortment of exchangeable color bumpers to choose from, your iPhone is simply a snap away from a vibrant new look. Plus, if you want to change your color, simply snap and replace with a new color bumper, it is that easy! The case also has the following functions built-in: charging switch, LED battery level indicator, charge & sync through the case, headphone jack cutout, function button cutouts. Never struggle with removing the case just to use your phone like normal! uNu uses only the finest designs, materials, and people when creating our batteries to ensure 100% reliability from anything we produce. That is why we gladly offer a 1 year warranty on our uNu DX-Lite Battery Cases to ensure our products stand up to the tests our customer put them to.