Sonos ZonePlayer ZP100 Add-On Player (Discontinued by Manufacturer) Wireless digital music player with built-in high-performance 50-watt amplifier Plays digital music files from your PC or networked hard drive anywhere in the home Connects to large or small speakers through spring binding posts Analog RCA-type audio input for connecting directly to CD or MP3 player Measures 10.2 by 4.4 by 8.2 inches (W x H x D); 1-year warranty