Eco Gadgets: PUYL Bicycle Pump Doubles As A Self-powered Light - Ecofriend: "Bicycle light gets powered by electromagnetic induction.
Designed by industrial designer Kai Malte Roever, the PUYL is a bicycle pump that doubles as a permanent illuminating bicycle light that doesn’t need a battery to operate. The patent-pending device consists of a normal bicycle pump, which in this case charges a built-in battery using electromagnetic induction."
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