MiLi Power Spring External Battery Case 1600 mAh Capacity for iPhone 4

This is the world’s thinnest iPhone 4 case with battery charger that nearly doubles the life of your battery. Say goodbye to chunky and clumpy additions to your iPhone that can make it almost impossible for it to fit in your back pocket.


Features:

Input:5V-0.5A Output:5V-0.5A Capacity:1600mAh(Li-Pol) Product Compatibility: iPhone 4 Standby Time: Up to 390 hours Talk Time: Up to 6.5 hours on 3G/Up to 13.5 hours on 2G Internet Use: Up to 6.5 hours on 3G/Up to 8 hours on Wi-Fi Audio Play: Up to 31 hours Video Play: Up to 9 hours