2000mah Rechargeable Extended Battery Pack Case Charger For iPhone4 4s (black)features:A rechargeable external battery concealed inside of a protective form-fitting case for iPhone 4; Offers full protection of a hard-shell case;Provides virtually twice the battery life of your cell phone alone; All

2000mah Rechargeable Extended Battery Pack Case Charger For iPhone4 4s (black)features:A rechargeable external battery concealed inside of a protective form-fitting case for iPhone 4; Offers full protection of a hard-shell case;Provides virtually twice the battery life of your cell phone alone; All in an ultra-thin, light-weight, low-profile and anti-skid design;USB cable for charging and USB sync with iTunes for iPhone;Built-in 2000mAh high capacity rechargeable lithium battery:Unique on-and-off button design;Four Led indicators for battery status;

Spesification:

Specification:Standby time: 270 hoursTalk time: 6 hours (3G), 12 hours (2G)Surfing time: 5 hours (3G), 9 hours (2G)Music-playing time: 36 hoursVideo-playing time: 9 hoursOutput voltage:DC 5VOutput current:500mAWireless output current:500mADimension: 129*65*18 mmWeight: 70g