This gadget does not look like the ordinary mp3 shape, but this one is very earth friendly because it can be powered by winding it up. One Minute of wind up will result 15 to 20 minutes of music playback. In total you can get up to 4 hours of music listening time, which will give your hand a 20 minute winding up exercise session. The 1 GB mp3 player retails for £39.10 (about $58 USD). [coolest-gadgets]
