Main features 1. High capacity in the market( 3000mAh 3.7V), allow you to watch 10+ movies on air plane with this 3G i Phone and i Pod touch external backup battery and you will not need to worry about 3G i Phone battery life any more! 2. Portability, it is small, much less than the palm size, which can be put into pocket to carry around 3. Ability to use i Phone while recharging 4. One full i Phone recharge with eath full battery in case 5. Secure fastening for keeping i Phone in place 6. Quality certificate: CE, SGS and RoHS KAYO is a China-Japan joint venture company, established in 1999, coorperated with domestic battery institute, our quality is as the same as Japan brands like Sony and Panasonic.