1. Digital LED showing obstacle distance 2. Alarm by Bi-Bi sound 3. LED display with three colors (Red, yellow & green) 4. Rear view mirror for the display, it clip on the exist mirror inside the driving room. 5. With 4 rear sensor to detect the obstacle behind the car bumper 6. Turn on/off the voice according to your desire 7. All kinds of sensor colors and styles are available 8. High quality and easy to install