Budget version
ON: normal mirror
OFF: no reflection

Premium version
DIMMER KNOB: goes from no reflection to reflection to enhanced reflection

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[–] 5 points 1 day ago

I believe it's actually a layer of film, I think it's typically sandwiched. So you'd have to make sure the back layer is just glass so it could be mirrorized.

https://en.wikipedia.org/wiki/Smart_glass

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