Do you often boring to have nothing to go key ring? see this message, someone say you bored you can refute, recently, the two designers Hyejin Song Lee Teaho and designing a finger power generation equipment, the use is very simple, just like the go key ring that turns to power generation, 130 laps to provide 2 minutes of talk time electricity or 25 minutes of standby time, although the efficiency of electricity is not very high, but when you're bored of the unconscious rotation also can point power, is good.
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