1.special for iphone 4 and for iphone 4S 2.Power supply & Protection case 2-in-1 for iPhone 3.full charge for iphone once

                                      Special for iPhone 4

                      Work as a protection case and extra battery  for iPhone 4

Features:

1.Almost the slimmest iPhone4 Power Case in the world

2.Power supply & Protection case 2-in-1 for iPhone4

3.Charge or SYNC with iTunes without taking  for iPhone4 out of the case

4.Anti-broken structure to protect  for iPhone4 from unexpected hurts

5.Sophisticated design never scratch the back for iPhone4

5.More than 200% increase for iPhone4 running time

6.4 LEDs show the battery capacity

Specifications:

Capacity:  1680mAh

Color: Black, White, Pink, Blue

Standby time:  Up to 380 hours

Talk time:     Up to 6.2 hours on 3G

Internet Use:  Up to 11.2 hours on Wi-Fi

Audio play :   Up to 38 hours

Video play:    Up to 11 hours

Charging Time:   3~4 hours

Dimensions:   126.5mm*62.5mm*18.5mm

Weight:           About 88g

1680mAh power case for iphone 4 mobile power supply