This EOLE concept watch is pretty cool. That red ring that looks like something from an electric razor commercial is actually a generator that creates the power needed to run the watch face when the wearer blows on it. I would think it needs a battery too or the time would be reset each time you stop blowing on the face. link
Nice idea, but a single human hair caught in the turbine will render it useless. Something radioactive would be much more dependable.
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Blowing on the face? I could get behind that.
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Add a breathalyzer to it and you might have something there.
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