The Sonos Digital Music System (SDMS) is comprised of two components, the Sonos ZonePlayer™ and the Sonos Controller™. Combined, the Sonos Digital Music System represents the digital stereo of the future. The Sonos ZonePlayer is a device that enables music to be distributed, played and amplified throughout a home. It has a highly efficient and powerful built-in amplifier (more than 50W/channel and less than 0.02% THD+N) to produce great sound in every room. The Sonos Controller is a wireless, handheld device with full-color LCD screen and intuitive scroll wheel that gives you total control over all your music and all your ZonePlayers from the palm of your hand. You can access music that's stored on any number of PCs in your house, Internet radio and even analog audio sources.