https://www.theverge.com/circuitbreaker/2019/1/15/18182214/amazon-echo-google-home-privacy-protection-project-white-noise

An open-source hardware project promises to keep Amazon and Google’s smart assistants from listening in on your private conversations by constantly creating white noise, as first spotted by Fast Company.

The gadget, called Alias, is an always-listening speaker, but it only connects to the internet during the initial setup process. That way, Alias stays “off the grid” while you’re using it, preventing your conversations from leaving the device, Bjørn Karmann, one of the developers, told The Verge. When the Alias hears its own wake word, it’ll stop broadcasting white noise and wake up Alexa or Google Assistant so you can use them as normal.