Never run out of juice in the middle of a conversation again with the Eton Mobius iPhone 4 Case. Simply put, the case has an internal battery that’s rechargeable through a sliver of photovoltaic cells behind it. Just soak it up in direct sunlight and you’re good to go. But when the sun’s not up, you can still store charge through USB power. Blinking LEDs tell you if you’re indeed transferring power to the iPhone’s internal batteries, while the green LEDs tell you how much charge you’ve got left. $100.
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