Wireless Car Parking Rear Reverse 4 Sensors Buzzer Radar LED Display Audio Alarm Features: Features: 1. No wire between the main unit and the LED display 2. The radar system turns on automatically when the car engine starts. 3. Beeping alarm prompt step bystep, closer the obstacle, more rapid the alarm sound. 4. Three colors green, yellow, red LED lights indicate obstacle distance. 5. Obstacle specific position distance shows on the LED screen. 6. Double CPU for rapid response. 7. 4 sensors with 2.5 meters lead for the rear 8. Specific figure for distance shows on the LED screen. 9. High quality and easy to install.