Car Auto Parktronic LED Parking Radar With 4 Parking Sensors Backup Car Parking Radar Monitor Detector System Backlight Display Features : 4 Sensor system, double CPU and advanced chipset for enhanced coverage and detection. With digital colored LED display (number & light). 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. Detect small children and low walls. Anti-freeze and rain proof. Easy to install.Specification : Detection Distance: 0.3m~2.5m Alarm Distance: 0.3m~1.5m Working Frequency: 40KHz Working Voltage: 12V DC Current Consumption: 20ma-200ma Working Temperature: -30°~70° Alarm Volume: 70~85dB Maximum Power: 2w Hole Size: 22~22.5mmNote : The maximum effective range of reversing radar detection is 2.5 meters. The sound reflection intensity of different obstacles is different, and the detection distance will vary. To All Buyers