なんとヨーヨーすることで充電するmp3プレイヤーだそうなw

Yes, the REGEN is a batteryless MP3 player that’s powered by the
action of Yo-yoing. It can store up to 200 songs on its built-in hard
drive. A touch screen LCD display allows you to control the player and
view time/song information. Pricing and availability have not yet been
announced.

REGEN – The Yo-Yo MP3 PlayerTechEBlog

10~12回程度回せば充電完了するらしいw
Bluetoothのwireless headphoneだから回している間も大丈夫なんだってさww

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