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This is a door-warning-light installation, which installed in the automotive mirror.
It will help to solve a problem by using the red projection which can warn dangerous areas when the driver suddenly open the door and hit the man.
Pull up the car, open the safety belt, which regards as a switch trigger projection device, prompting passengers to avoid danger when the door suddenly opened.
Before getting off the car, the driver needs to open the safety belt, so this trigger device is very ingenious.