nPower PEG is a charger that can convert your kinetic energy into an electrical energy. This device consists of a load, spring, inductive coil and a battery. The longer you move, then the more electrical energy that can be stored in the battery. Once you are exercising, you can use it to recharge your gadget via USB 2.0 port.
If you walk for 1 minute, nPower PEG is capable in generating electrical energy to play music in your iPod for 1 minute. While if you walk for 11 minutes, this charger will generate electricity for 1 minute talk time with 2G on iPhone. And finally, if you walk for 26 minutes this device can produce energy to support your conversation on iPhone by using the 3G network.
nPower PEG is sold for $200.
Source: nPower PEG