Eddy current

The key is so-called eddy current technology (http://en.wikipedia.org/wiki/Eddy_current): Energy is drawn from the rotating bicycle wheels without any physical contact, and thus without friction. Instead, eddy currents created by strong magnets generate electricity to power the lights:

When the wheel spins, magnets inside the generator induce eddy currents with corresponding magnetic fields in the wheel, which in turn interact with the magnets in the generator. The resulting electricity will power your lights indefinitely without any environmentally harmful batteries or cumbersome cables.

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