T&J WORLD TM External Backup 4000mAh Battery Power Bank Flip Leather Case For Galaxy S4 i9500 1. Material: ABS +PC 2. Battery capacity: 4000mAh 3. Output: DC5V/1000mA 4. Input: DC5V/600mA 5. Cycle life: 500times 6. DC charging time:4hours 7. Weight: 180g 8. Chargering/sync ,simply plug in the USB turn micro USB to the micro USB female dock, connect the USB to a powered USB equipment or computer. 9. Dimensions: 150x75x18mm