Battery capacity: 5,000mAh (theoretically 5,000mAh, actually 4,000mAh) Battery type: Li-polymer battery Input voltage: 5V DC Features: Works with most MP3 players, ... and elegant profile, compact for easy carryingSpecifications: Battery capacity: 5,000mAh (theoretically 5,000mAh, actually 4,000mAh)Battery type: Li-polymer batteryInput voltage: 5V DC ...