Required: On-Q Digital Audio http://www.legrand.us/onq/digital-audio.aspx The On-Q Digital Audio app makes it easy to control the music you love throughout your entire home. Designed for intuitive and aesthetic wireless control of your entire On-Q Digital Audio System (sold separately), the app puts the expansive variety of Internet Radio, plus your personal music library, right in the palm of your hand. Play any music selection from your iTunes or Windows libraries, or even access audio from favorite streaming services. Enjoy the listening freedom.