I have the Google Home mini speaker with 1 smart power plug that I can plug any 120 volt appliance to control. I was just thinking about what I should try to control; The great thing is I can use many different Voices male or Female and even a custom Male Robot voice. It can run on with a car 12 volt DC Lighter plug to USB cable (5volt 3 Amp) I just have 1 smaller 12 volt SLA battery that runs it several hours, I have not yet tried to run it on the Roomba battery supply yet but interesting test for tonight, then ditch the heavier SLA battery. On my Giant Cylon project no issue there, I use the Google mini as the main Bluetooth speaker that EZB talks with  and it is Loud with impressive bass for a small puck speaker! It does listen to me and can hear me from the washroom even on the other side of house. Smart plug can be turned on and off for many devices all at once. coffee meker in morning,lights, Roomba battery charging , many idea to think up. Am I the only one that uses Google Home, (I hated Alexa for the choice of limited voice.).From all my phones ,integrated into robot and Google mini so I can even just call robot from my phone or ask the same Google assistant voice on my phone info,weather, news. Lock downs have been fun last few months. I'm guessing Alexa does all this too but I still think Google is the winner. `

Well I was going to do a tear down of my 3rd gen echo dot but then I thought...wait a second....someone has probably already done this! Sure enough, it’s been done: https://www.briandorey.com/post/echo-dot-3rd-gen-smart-speaker-teardown