ePathChina LED Display Waterproof Car/Truck/Vehicle Reverse Backup Radar System with 4 Parking Sensors This car parking sensor system comes with 4 sensors, easy-to-read color LED display with beeping alarm displays whether an obstruction is to the right or left. With digital LED display, show the distance and the direction between your car and the back obstruction. LED display indicates Right, Middle and Left. With Bi.Bi.Bi alarm, the closer, the more rapid alarm. Help to prevent dangerous and costly collisions. Help to provide increased safety for passengers, pedestrians and family members who happen to be around the moving vehicle. Dual CPU system.Step-up alarm.Intelligent anti-interference analysis.Detect small children and low walls as well. Obstable of orientation indication.Operating temperature: -40 degree to 80 degree.Sensors installation height: 50cm - 70cm.