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Swing is a mp3 player using kinetic energy by finger or pen.
The ideation is from a habitual movement that people are used to swing something hanging on a finger. The shape is designed for effective rotation by hand movement, thus it charges the battery easily.
Cho Chi Won, South Korea
Yeon Soo Kim
Chi Hoon Han
Seoul, South Korea
Yeon Soo Kim Byonggon Park Chi Hoon Han