It uses the reverse principle of a loud speaker, which coverts the electric signal to voice,
the present technology converts voice to electricty. Scientists say this technology is used up to charge up the cell phones , ipods and all other low voltage devices.
The devices made so far can convert up to 1000db , which is equal to noise in traffic , a near by train noice etc.
So if there is rock band concert nearby ,then attend it for atleast 5min!
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