The Sonos Connect:Amp Gen 2 S2 is a 2nd generation digital streamer amplifier that is compatible with digital media formats such as AAC. It features a gray color and supports surround sound formats like Dolby Digital. This unit offers connectivity options like Wi-Fi and Ethernet port, as well as audio/video outputs in Digital Audio Coaxial RCA format. With its MP3 playback capability and RCA stereo features, the Sonos Connect:Amp Gen 2 S2 is a versatile and high-quality device for enhancing your home audio experience.