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Many EV's have a charging status indicator visible through the front windshield. Maybe putting one on the mirror was easier for wiring?
Otherwise it clearly has to be a first of it's kind Autonomous Vehicle to Meatbag communication device. Instead of the you go/I go wave at 4 way intersections, the Model 3 when on Autopilot has a green or red light illuminating the cabin which is visible to manual Drivers and Peds