self powered devices

These are devices which can power themselves without using batteries or ever having to re charge equipment. For example a mobile phone would power itself with the sound waves created from talking. This done by using a special material and is helped by nano technology. This would revolutionise portable technology. Imagine never having to charge your mobile phone. This technology will probably also be utilised by secret services because sensors for bombs can be given to soldiers so that they are not killed. This technology is quickly advancing and expect new things soon.