
Shown above is a wireless transmitter powered by the heat differential between a man's hand and the ambient room temperature. Only 200 millivolts is required to drive the device which is just about what such a limited differential of just a few degrees (Celsius) can provide. Single processor units in modern handhelds alone require about 1W to operate so 2mW is a long way off.
For more information visit:
http://www.fraunhofer.de/fhg/EN/press/pi/2007/08/Researchnews82007Topic1.jsp
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