Specification Suitable for: Samsung Galaxy S IV S4 i9500 Capacity: 3200mAh Output Voltage: 5V Output Current: 500mAh Input Voltage: 5V Input Current: 400-500mAh Charging time: approx. 1.5h FCC / CE / Rohs / UL certifications approved GVKAR Warm Prompt 1、Brand from GVKAR (TM), Fast high-quality performance of FBA 2、The battery capacity and usage time depend on your usage way and charging time. Also, it's better not view video or make calls when you charging your phone. Or else it will shorten the external battery life, just as you know, the battery has a memory function. 3、 If you don't use it long time, please make sure to charge it every 3 months at least.