Even though portable devices like cellphones, PDAs, and MP3 players have gotten smaller, more sophisticated, prettier, and lighter over the years, there's still one inconvenient tether anchoring wired consumers to...

Even though portable devices like cellphones, PDAs, and MP3 players have gotten  smaller, more sophisticated, prettier, and lighter over the years, there’s still one inconvenient tether anchoring wired consumers to their home bases: the battery cord.

Fortunately, the folks at Citizen Watches have found an elegant solution: The brilliant Eco-Drive design. Effectively a solar battery for watches, Citizen’s invisible Eco-drive recharges whenever it comes into contact with light and can store enough energy to power its watches for five years–in the dark.

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