Now you can truly take your iPhone 4 anywhere! The Eton Mobius Rechargeable Batter Case with Solar Panel gives your iPhone 4 power with just solar rays. The high efficiency monocrystal solar panel provides optimum power and remains lightweight. It protects and powers your iPhone at the same time with its proprietary snap fit design that stays on and prevents the back from being scratched. A simple USB connection charges and syncs while the battery charge and solar charge indicators tell you how much power you"ve got. For extra power all you need is a little sun and the Eton Mobius Rechargeable Battery Case with Solar Panel for iPhone 4.