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PUYL is a bicycle pump and portable light combined in one device. It is the first permanent illuminating bicycle light which does not need a battery. This combination provides an unlimited light source and a bicycle pump for urban cyclists. The idea is based on Faraday's law of induction. Instead of batteries, it uses electromagnetic induction. The electricity is generated by moving the compressor/ magnet through the two copper coils that are located around the inner compression tube. The light’s battery is charged while pumping.
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