Eton has plenty of solar-powered devices and green solutions in their product lineup, but the Mobius case for the iPhone 4 allows you charge up your phone by using the sun, without having to carry around an external charger. Eton was able to streamline the design, so it’s not clunky.
If you don’t want to leave your iPhone sitting out in the sun, you can also remove the pack and charge it up separately. Once the Mobius is in the sun, charging starts immediately. There’s a handy LED readout to let you know how much of a charge is left in the pack. It can also be recharged using a USB port. A full charge will double the battery life of your phone, which is about 5 hours of talk time or 8 hours of 3G Internet or video playback. There’s a camera hole so that you can still take photos.
An hour in the sun gets you 25 minutes of talk time. The hard plastic case will also protect your iPhone. Mobius is slim and lightweight, and sells over at Amazon for about $80 (USD).
[via Cool Hunting]