A variation of the Auto-Dimming (Interior) Mirror, it automatically displays an image of the people and objects behind the car

Another safety and convenience feature developed by Kingband is a video display located in the auto-dimming rearview mirror. When paired with a backup camera the display shows a real-time panoramic view of the rear of the vehicle. The display appears through the mirror glass automatically when the vehicle is shifted into "reverse" it disappears when the vehicle is shifted into any other gear.

Reverse Camera Display Mirror