Questions about Google Chromecast Audio

The Chromecast Audio is specifically designed for streaming audio and does not support video casting. It is intended to upgrade existing sound systems to networked, wireless-streaming capability, but it does not have the functionality to stream videos like the regular Chromecast. You can cast audio from various sources, including supported apps on your phone or tablet, and even mirror audio from your mobile device or a Chrome browser on a computer. However, it does not have the capability to stream video content.

According to the information I have, you can still use it. I have one myself at home and it works.