It’s environmentally friendly, can come in handy during a power outage, can power your MP3 Player AND it tones your thighs. This gadget is a step above the usual crank powered chargers. It can be pedaled using your arms or your legs. In addition to powering small electronics, it has a built in LED on the battery so it can be used as a flashlight. You have to admit, it would be pretty satisfying to know that the songs you’re listening to on your MP3 were powered by your own sweat and tears!