http://www.appliedinnotech.com/products/shake-flashlights/shake-flashlights.php

Shake flashlights are not like other flashlights since it does not run on batteries. A little shake and its ready to light your way. Nightstar shake flashlights convert the energy produced by shaking to electrical energy by means of a highly powered magnet which moves back and forth through a coil of wire due to shaking. They...

Keywords: Science