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The design is a self-generating battery recharger using YO-YO torque.
Smartphone users normally carry a recharger when they go out for a case
when the battery is dead but it is inconvenient to find a socket.
The product is a battery recharger that can recharge by self-generation
without a socket, and YO-YO is an additional fun to the design.
Pusan, South Korea
Lee in hwan,
Moon tae soo,