https://www.cnet.com/news/capstones-smart-mirror-comes-to-ces-with-google-assistant-built-in/

The mirror does require the Capstone Connected Control Hub. The hub is also a touchscreen device, like a tablet, that acts as the command center for the mirror. 

You can hang the Capstone Smart Mirror or stand it up on a counter. The mirror will be available in multiple sizes, beginning with a 19-inch by 22-inch model in early 2019. Pricing information is not yet available.