Sonos amplifier (ZP100) in great condition and works perfectly. This was part of a sonos system to power passive speakers.

The Sonos ZonePlayer 100 (ZP100), which is part of the complete Sonos Digital Music System. The ZP100 brings great sounding music to any and every room in your house -- regardless of where your music collection is stored. That's because the wireless ZP100, with its built-in amplifier, will work anywhere you've ever dreamed of having music. You can even play the same song in different rooms or different songs in different rooms.