AceAbove 3200mAh Protek Air External Protective Galaxy S4 Battery Case - White - Fits All Versions of Samsung Galaxy S4 / S 4 / SIV/ S IV Models) 12 Month Warranty The powerful 3200mAh built-in battery can effectively double the battery life of Samsung Galaxy S4 Featuring a fully protective hardshell case with the minimum added bulk. Enjoy the comprehensive protection while still maintain the slim form factor of your iPhone. The case featuring a MicroUSB input port Deploys the most reliable battery technology, which can live up to its standard and being rechargeable for more than 500 cycles 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.