@Firr 3 LEDs (green, yellow, red, like a traffic light) perched on the top of a computer monitor (like a webcam, and a button to light them up alternatingly. This warns others around that one is in a Zoom or Teams call. Red means do not disturb (to one's family or roommates). Yellow means will be available soon. Green means available. It's silent signalling to one's household members without the meeting participants noticing.
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