For iPhone 3g battery Features: 800mAh Battery and Soloar panel design Rechargeable under sunlight or with USB cable Up to 1000 times rechargeable use Easy to operate Plug it to start charging Specifications: Battery Type: Li-ion Capacity: Max 1900mAh Rated input: 5V,800mAh Rated output: 5V,500mAh Charging Time: About 2.5 hours Compatible with iPhone 1st generation and iPhone 3G Dimensions: 67*62*15mm Weight 65g