It’s simple, really. You stop running, the music stops playing. Inesa Malafej and Arunas Sukarevicius designed the Dancepants to power a built-in MP3 player by capturing the kinetic energy of the wearer. No need to charge your batteries before a run–or rather, all the more reason to fuel up before heading out so you don’t run out of steam in the middle of your favorite tune.
Via Engadget.
That’s pretty cool.