Its an interesting idea and might turn to be the greatest boon for many people who either hate when people just talk too loud or when you are asked to move out banks and other places to attend your phone.
According to BBC Tech
The device, on show at the Cebit electronics fair in Germany, relies on a technique called electromyography which detects the electrical signals from muscles. It is commonly used to diagnose certain diseases, including those that involve nerve damage.
Welcome to the Future of Silent Communication. Lets hope someday it turns out to be reality.
