The Sonos Controller CR200 is a touch screen remote control for the Sonos Multi-Room Music System.  The Sonos Multi-Room system is a wireless music system. Products called "ZonePlayers" are placed in each room of the house where a user wants to play music. The user can then control what music plays in each room using a handheld Sonos Controller. The system is completely flexible--the same music can be played in all the zones at the same time (party mode), or different music can be played in different rooms or any combination of rooms.