Take a break from your work and look around you. There are bound to be some colleagues who sit at their desks but have the habit of shaking one's legs up and
down repeatedly, or twiddling with the telephone cord while carrying out a conversation. All that is wasted energy and could be the only form of exercise they get. Why not save them the trouble of such wastage and convert such physical activity (if you could call it such) into usable power? The FreeCharge Weza does exactly that and comes with a built-in foot pedal, where a person can then step on it repeatedly in order to charge the internal battery that will provide direct 12-volt power instead. When used with the right kind of cabling or converters, the FreeCharge Weza can be used to provide power for emergency lighting, replenish the battery levels in your gadgets, and is even capable of jump starting a car with a dead battery. This nifty device costs $269.99 and makes for an interesting office gift.Pros : Turns energy into usable power
Cons : None
FreeCharge Weza turns kinetic energy into usable power Source
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