I have two, auction is for one, will discount second AMP if you buy one. Perfect condiiton, work well. Only selling as I have upgraded. ....From SONOS Web site...... The Sonos Connect:Amp is a streaming amplifier that delivers 125W per channel, allowing you to connect passive speakers and stream music wirelessly or through a line-in connection. It's designed to power speakers in a single room or to be part of a multi-room audio setup. Key features and specifications: Amplifier: Class-D digital amplifier with 125W/Ch into 8 ohms. Speaker Connections: Banana plugs (2). Line-in: Auto-detecting analog (RCA) line-in connection. Wireless Connectivity: SonosNet, a secure AES encrypted, peer-to-peer wireless mesh network. Network: 2-port switch (10/100Mbps, auto MDI/MDIX). Power Supply: AC 120-240V, 50/60Hz, user-switchable. Dimensions: 3.50 x 7.28 x 8.15 in. (89 x 185 x 207 mm). Weight: 5.1 lb (2.3 kg). Operating Temperature: 32°F to 104°F (0°C to 40°C). Buttons: Volume and Mute. Front Panel Lights: Indicate Sonos component status and Mute status. Finish: Anodized precision machined extrusion aluminum case. Additional details: The Connect:Amp can be used with various audio sources, including streaming services, digital music files, and analog line-in devices. It supports both 8-ohm and 4-ohm speakers, with a recommendation to avoid speakers rated less than 4 ohms. The Connect:Amp is compatible with both the S1 and S2 Sonos apps. While the original Connect:Amp is no longer receiving software updates, Sonos says that the Gen 2 Connect:Amp will continue to be supported.