Freespin is a music player which I designed . The project is all about a hands free interface to control music playback including browsing songs , changing volume etc. The device is targeted at athletes / joggers for whom music is an important activity which helps them focus on their running.
However fiddling around with controls and watching screens while running is a highly dangerous distraction.
Hence the core control interface of this device is 2 rings which the jogger wears and this lets him control playback .