Oh, please, all this Alexa bashing is beginning to get ridiculous. "Subscription services are bad!" "Multinational megacorps are spying on me!" "The little men that can only be used for evil cost too much!" "Alexa is where all the souls of the dead are used to train artificial intelligence and once Amazon merges with Boston Dynamics the souls will be installed into robot dogs and take revenge on the living by clamping our necks off as we sleep!"
Boo hoo. So what? Getting your neck clamped by a haunted robot dog is just the wave of the future. Don't like it? Go be Amish.
Simply put: radar works by monitoring the return bounce of soundwaves. Wifi signals can be used in much the same way. Any device that emits and receives wifi can see you.
Looks like the Echo Show. It has a camera. It was marketed that you'd be able to have it take your picture, and then it'd give you a little "virtual try on" of clothing from the amazon store.
The camera is sufficient for detecting movement, obviously.
In a very inefficient way though, basically just a worse version of a dedicated presence sensor. I think it works not by bouncing actual RF pings off the target but by monitoring signal level changes in received packets (against known references, i.e. stationary wifi devices like a printer) when someone gets in the way.
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u/Psquare_J_420 7h ago
Alexa can see?! (Never owned one so I have no idea) Or it can sense people like using ir rays?