Class D amplifier provides 125 watts x 2 into 8 ohms,front-panel controls for volume, play/pause, previous/next track 2-port Ethernet switch powers your architectural, outdoor, floor-standing, or bookshelf speakers binding-post speaker terminals capable of stereo or dual mono output can connect to a TV HDMI input (ARC) optical digital input supported (with adapter, sold separately) rack-mountable 8-9/16"W x 2-9/16"H x 8-9/16"D weight: 4.6 lbs. Works with Sonos Wireless Music System More power. More possibilities. With 125 Watts per channel, Amp supports high-fidelity sound for outdoor, bookshelf, floor-standing, and architectural speakers. Create the ultimate entertainment system. Sonos works with over 100 streaming services so listeners can enjoy the ones they prefer, and Amp includes an HDMI ARC input to connect to TV and a line-in for connecting a turntable or other audio source. New ways to customize the experience. New APIs and partner integrations streamline smart home control with phones, tablets, universal remotes, keypads, and voice via smart devices. Flexible control. Use the Sonos app, AirPlay 2, a universal remote, the touch controls on Amp, or your voice with smart devices such as Sonos One and Beam. Versatile design. Amp fits standard racks and can be wall mounted, plus it features a simplified set of ports for clean-looking connections. Amazingly pure sound. Direct digital input eliminates the need for analog conversion, resulting in crisp, undistorted sound for music streaming and TV.