Features:1. 4 sensor system， double CPU and advanced chipset for enhanced coverage and detection.2. With Bi.Bi.Bi alarm， the closer， the more rapid alarm.3. Help to prevent dangerous and costly collisions， enhance the safety features with simple installation.4. Help to provide increased safety for passengers， pedestrians and family members who happen to be around the moving vehicle.5. Step by step alarm with LED display.6. Anti-freeze and rain proof.7. The detector of the radar perfectly matches the car body.8. Water-proof control box for flexible installation.9. Universal fit for cars， trucks and .Specifications:1.Rate Voltage: 12V2.Rated Current: 20 ~ 200mA3.Operation Voltage: DC 9 ~ 16V4.Detacting istance:- Detecting Distance: 0 - 250cm- Display Distance: < 250cm- Alarming Distance: < 150cm5.Ultrasonic Frequency: 40KHz6.Working Temperature: - 30 ~ + 70 Celsius degrees7.Display Working Temperature: - 20 ~ + 60 Celsius degrees8.Display cable length:approx.5.3m9.Sensor cable length:approx.2.5mPackage included:4 x Sensor1 x Mainbox1 x English User Manual1 x Power Cable1 x Drill1 x Display