Brand N/A Quantity 1 Piece Color Black Material Electronic components + ABS Compatible Models Samsung Galaxy S4 i9500 Battery Type Polymer battery Capacity 2400 mAh Input Voltage 5 V Output Voltage 5 V Output Current 500 mA Features Thin and lightweight Others 1. Case with battery build-in polymer battery capacity is 2400mAh it can charge and discharge in cycle it means you have two batteries make sure that your phone power can work double time; When charging you need not to take out the "case with battery" just as your phone original way; 2."Case with battery" follow the design which not only can power supply but also protects your phone it's ultra-thin and fashionable feature will make your life more convenience and fun; Usage information: Please read the instructions carefully Packing List 1 x Back case with battery 2 x Ribbon cables