In 2013, Google introduced the Chromecast , a plug-and-play dongle designed to make streaming video from a mobile device to a TV easier. In 2015, the company followed up with Chromecast Audio, which bridged audio-streaming apps to legacy audio equipment equipped with an analog or optical input.

Google’s latest audio product, the Chromecast Audio, distills everything the company has learned about content streaming into a simple, affordable device the size of a York Peppermint Patty. And Sonos, the leader in wireless, streaming whole-home audio, has reason to worry. At $35, £30 or AU$49, Chromecast Audio capably fulfills its core promises at a very affordable price, especially now that the system now (also) supports voice control.
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https://www.cnet.com/reviews/chromecast-audio-review/2/