iFans Portable Power & Protection Case for iPhone 4S- Pink-Blue -Portable power bank compatible to iPhone 4s . Capacity-1450mAh -Come with slim profile changeable frames -Built-in battery -Capacity: 1450mAh Input: DC 5V/1A Output: 5.0 +/- 0.25V==1A -Standby up to additional 300 hrs/Talk-7 hrs/Surf- 6 hrs/Watch- 10 hrs