This leather case fits both the 2G and the 3G model of the iPhone and it is using the environmentally friendly solar power technology to provide your cellphone with some extra juice when the standard battery is running flat. features： 1. Light weigh, small, without noise, take-easy, can be used anywhere. 2. Saved energy products. It can accumulate the energy where there is sun rays and to charge the small electric products. 3. Environment protected products. It couldn’t make any pollution to environment and happens to warm effect. 4. Convexity used. 5. 5-1Charge the cell phone full of power within 2.5 hours. 5-2 Full charge the MP3 within 1 hour 6. With solar panel, It takes 10 hours to charge the stored battery fully; with home power adapter, it takes 2.5 hours