Fangrui Product Details 1. Car Buzzer Reverse Backup Radar System - Premium Quality 2 Parking Sensors Car Reverse Backup Radar System 2. Detecting Distance: 0.3~3.0 Meters 3. Sensor Diameter: 220 Cm 4. Monitor Type: Na 5. Working Voltage: 12v 6. Rated Current: 50 Ma 7. Ultrasonic Frequency: 40 Khz 8. Alarm Volume: 65 Db 9. Working Temperature: 20~70 Centigrade 10. Features: 11. Indicates Object Distance With Different Beeping Frequencies, The Sensor Antenna Activates 3 Types Of Acoustic Signals During Approaching An Obstacle At Different Distances; 12. A Continuous Sound Of Beep Approximately Between 0-0.3m; 13. A Short Interval Sound Of Beep Approximately Between 0.3-0.5m; 14. A Long Interval Sound Of Beep Approximately Between 0.5-0.7m; 15. Simple And Concealed Installation; 16. The Sensor Antenna Is Entirely Installed Inside The Bumper Without Any Drilling Work. 17. Fit For Any Car, Truck, Rv Or Mini-van