Seeme Extended Battery Case Back up Power Bank for Samsung Galaxy S4 I9500 (White) The powerful 3200mAh built-in battery can effectively provide 100% additional battery life to your phone, which adds additional 11 hours of talk time and 15 hours of web browsing time. Featuring a fully protective hardshell case with the minimum added bulk. Enjoy the comprehensive protection while still maintain the slim form factor of your phone Featuring a MicroUSB input port and output port, the case has data and power pass-through enabled The Seeme Battery 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 and hands-free kickstand.