power packs external backup battery charger case for iPhone 4 and 4S

1.100% Original brand new 2.Best Price 3.Safe & fast delivery 4.Excellent After-sale service 5.Minimo 5pcs per model

Features:Smart Battery (Optimized to extend your iPhone performance time; No more out of power dilemma during important phone coversations)Full Body Coverage for Phone 4 4S 4GLightweight, thin design (low profile)Non slip comfort gripUSB charging and SYNC without the need to disconnect your iPhone 4 from the caseAutomatic test functionData transmission      High-quality Li-polymer CellExtended battery pack - 1900 mAhON/OFF Button for Optional Power Output ControlFour LED lights indicates the power level remaining the case (Each light represents 25% of remaining power)Sleek, Low-Profile design; Rechargeable up to 500 times

Specification:Input: 5V 500mAOutput: 5V 500mACapacity: 1900mAh / 7.2WhLife Cycle: 500 timesCharging Time: 4.5 hoursStandy Time: Up to 230 hoursTalk Time: Up to 6 hours on 3G; Up to 12 hours on 2GInternet Use: Up to 5 hours on 3G; Up to 8 hours on WiFiAudio Play: Up to 30 hoursVideo Play: Up to 8 hoursBattery Capacity IndicatorDimension: 125 x 63 x 16 mmWeight: 65gColor: Black, White, Green, Blue

power packs external backup battery charger case for iPhone 4 and 4S