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Dynamo technology is not new — flashlights and radios have been outfitted with it for years

How does the technology work?

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This case has a slim generator inside that charges your phone when you crank the handle.  The generator connects to the phone through the 8-pin port.

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Case uses a magnetic dynamo generator to produce the power needed to charge the phone.

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This uses a rare earth metal spinning inside a magnetic field to generate electrical current inside a coil of wire spun around the magnet.