People can see through the colored "smart glass" when it's not in use. The glass then turns opaque when the door is locked.
from Yahoo News - Latest News & Headlines https://ift.tt/3aLRlLP
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People can see through the colored "smart glass" when it's not in use. The glass then turns opaque when the door is locked.
from Yahoo News - Latest News & Headlines https://ift.tt/3aLRlLP
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