2000mAh Backup Battery For Iphone 4

2000mAh Backup Power for iPhone 4work for Iphone 4 when the internal battery is low Great solution for travelling, hiking, etc. Test button on the back for testing remaining power To charge it simply connect it to your computer using your existing iPhone cable Specifications: Standby time: Up to 270 hours Talk time: Up to 6 hours on 3G, up to 12 hours on 2G Internet use: Up to 5 hours on 3G, up to 8 hours on Wi-Fi Audio playback: Up to 30 hours Video playback: Up to 8 hours Capacity: 1900mAh Battery type: Li-ion polymer Input: 5V 500mA Output: 5V 500mA Dimension: 125 x 62 x 18 mm Weight: 65g Compatible with: iPhone 4