Nov 10, 2010 this is how they communicate with me(silently) A voice-operated control system and an ultrasound-based driver information system take convenience even further. The ultrasound technology targets the sound at the driver so that only he or she can hear the information from the navigation system, the traffic news and other sound-based information sources, while the front passenger and rear passengers remain undisturbed. http://www.conceptcarz.com/vehicle/z7450/Mercedes-Benz_F500%20Mind/default.aspx