Charge your phone by SHOUTING at it: Gadget converts sound waves from speech into five volts of energy for your mobile
- Prototype created by Queen Mary University of London and Nokia
- The device, which is about the size of a mobile phone, uses zinc oxide
- Zinc oxide produces electricity when subjected to mechanical stress
- Stress could come from vibrations in sound that move tiny rods
- Invention was inspired by research which found playing pop and rock music improves the performance of solar cells
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