The Sonos Connect Amp S2 is a 2nd Generation standard digital amplifier unit by Sonos. It is compatible with AAC audio formats and features digital audio coaxial RCA outputs, making it easy to connect to your stereo system for high-quality sound. This unit also supports home network media streaming, allowing you to enjoy your favorite music from your smartphone or tablet. With Wi-Fi and Ethernet connectivity, the Sonos Connect Amp S2 offers a seamless and convenient way to enhance your home audio experience. Tested and works - Used but perfect condition