High capacity external battery for iPhone 4/4s

Four characteristics: Travel, travel, business, entertainment battery backup best choice!

Specifications
Rated capacity: 3000mAh-3800mAh
Standby time: 120 hours
Talk time: 3G network, more than 5 hours / 2G network of more than 10 hours
Internet access: 3G network, more than 4.5 hours / Wi-Fi more than 7 hours
Music player: More than 48 hours
Video playback: Over 6 hours
Weight: 112g, Size: 157*87*17MM
Batteries: Lithium polymer batteries
Charging time: 3-4 hours
Output voltage: 5V Output current: 500mAh
Input voltage: 5V Input Current: 500mAh
Product Features:
Features: Built-in 2000 mA, so you do not have to be careful suddenly no power troubles.
Characteristics at any time to meet your business office and microblogging editor.
Features: Truly, anti-sweat, drop, dirt.

We can offer blackberry, Samsung, HTC external battery and all the spare parts, welcome inquiry!