Amazon.com: WiiM Pro AirPlay 2 Receiver, Chromecast Audio, WiFi Multiroom Streamer, Compatible with Alexa, Siri and Google Assistant, Stream Hi-Res Audio from Spotify, Amazon Music, Tidal and More : Electronics
Google Chromecast Audio Adds Multi-Room Support | PCMag
Google's Chromecast Audio WiFi-enables your speakers, packs multi-room support
Google updates Chromecast Audio with multi-room support, hi-res audio playback – GeekWire