The xPRESS Audio Keypad is a "Works with Sonos" product.  This means the iPort and Sonos worked together to create a product that functions well and is a great experience for you.  With the xPRESS Audio Keypad, you now have quick access to all of your Sonos music, wherever you are in the home.  And xPRESS will keep getting even better with great new features coming soon as free Software and Firmware updates.