Many people watch online lectures or listen music while studying in libraries. They don’t realize that other people around them can actually hear the music and feel disturbed. Yet, if volume is too low, they can’t really focus or enjoy the moment. Sound-free is a smart desk that has "The Ultra Directional Speaker," designed to help you enjoy music and listen to lectures in the library without disturbing others. It radiates sound in one direction only, thus the sound can only be heard within the selected zone.