Back and forth movement of tiny zinc oxide wires creates electricity, which in turn can be used for charging. For now the only current a prototype was able to generate is 50 millivolts of electricity from sound with 100 decibels strength, or about the noise from heavy street traffic... Phone Arena 09 May, 2011--
Source: http://www.phonearena.com/news/Scientists-harvest-sound-to-create-electricity-cell-phone-blabbers-vindicated_id18699
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