Well, this is certainly original. As it says on the website:
http://www.techeblog.com/index.php/t...-yo-mp3-player

And it has got bluetooth connectivity so one doesn't have to worry earplugs/headphones will get caught while yo-yoing. I think the most interesting thing here is that it is depends on kinetic energy to run it; no batteries.

So, do you have to Yo-yo the whole time you are listening to music? I cna't see that working for me. i can't walk and chew gum at the same time.