https://www.cnet.com/news/alexa-talks-to-you-through-a-disembodied-robot-head-at-ces-2019/

The robot takes input from your Echo speaker and, based on the frequency of the audio, moves Alena's mouth to replicate speech. Ask your Alexa about the weather, or whether androids dream of electric sheep, and your answer comes out of the mouth of Alena. 

Part iRobot, part Princess-Mombi-head-in-a-cabinet, Alena the robot is uncanny. But it's amazing how quickly you feel like you're talking to something more human than just a speaker.