In order to make a unique MP3 player for a niche market, Sung-kyu Nam provides a design like this.

Different from those for adults and elder children, this one features two separated parts. One is a toy with a built-in RFID tag; and the other one is actually a MP3 player shaped like a hat. Just put the toy into the hat, music is start playing with a built-in speaker and you can adjust the volume by rotating the hat.

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Designer: Sung-kyu Nam