It's my understanding that there's a low power, always-on service listening for stuff like "Alexa"/"OK Google", and only when it hears a keyword does it start "

It's my understanding that there's a low power, always-on service listening for stuff like "Alexa"/"OK Google", and only when it hears a keyword does it start "listening" and sending data back for parsing/processing. I could be wrong and/or they could be lying about how the product really works. Could probably monitor your network traffic if you really wanted to find out.