This technology aims to use the human body, which can accept an electric charge and send a very small electric current, as a means of communication. Professor Koji Mitsubayashi of the Tokyo Medical and Dental University (TMDU) has developed a sensor that can pick up electrical charges on the human body as magnetic information. Unlike wireless communications there is no worry of these signals being picked up by others, and so the system is very safe. Prospective applications include cordless headphones and electronic door locks that can be opened by simply touching the door.