Another form of power.
The wearable technology unobtrusively generates electricity from the natural motion of walking and uses it to charge a wide range of portable battery-powered devices. The Harvester resembles an orthopedic knee brace, weighs about three pounds, and extracts up to seven watts of electricity from each leg - roughly the amount needed to simultaneously operate 14 mobile phones. The next generation of the device will be much smaller, lighter, and even more efficient.

http://www.bionic-power.com/tech.html