KKmoon LED Car Parking Reverse Backup Radar Sensors System Anti-freeze Rainproof with Backlight Display White LED digital display with BiBi sound reminder. Be beneficial to prevent dangerous and costly collisions. With a drill head, convenient to drill hole. 4 sensor system, double CPU and advanced chipset to enhanced coverage and detection. Help to provide increased safety for passengers, pedestrians and family members who happen to be around the moving vehicle.