Our Car Door LED Warning Light is a built-in magnetic sensor. The warning light will start flashing when the car door is opened. Then the light can warn the rear pedestrian or vehicle & avoid accident or collision.
It fits for any cars, SUV, truck. It is wireless design, do not destroy the original car lines, only need to stick them at the door. The light will start flashing for two minutes once when the car door is opened, and then the light will turn off automatically.