Charge your phone by SHOUTING at it.

Charge your phone by SHOUTING at it. Gadget converts sound waves from speech into five volts of energy for your mobile phone.Researchers in London have created a new technology that uses sound, such as chants at a football ground or chatter in a coffee shop, to charge up mobile phones. Their prototype device, which is about the size of a mobile phone, uses zinc oxide to convert vibrations caused by sound into electricity