MiLi Power Spring 4 Portable Battery Cover Case for iPhone 4/4S – 2000mAh
- Fully enclosed external battery case for iPhone4, with a patented top flip cover..
- 2-in-1 protective case and battery, improving the iPhone’s battery life.
- Audio opening, preserving the sound quality from the iPhone4.
- Can sync the phone with iTunes using a data cable without removing it from Spring4.
- Capacity: 2000mAh
- Input: DC5V/0.5A
- Output: DC5V/0.5A
- Self-charging time: 4.5 hours
- Standby time: 450 hours
- Talk time: 7.5 hours on 3G 16.5 hours on 2G
- Internet use: 7.5 hours on 3G 13.3 hours on Wi-Fi
- Audio playback: 45 hours
- Video playback: 15 hours
- Dimensions: 124 x65 x 18 mm