Parking Sensor with Smart LED Display,Reverse Parking Sensor System:1. Digital LED display, 4 rear ultrasonic sensors, "Bi Bi..."Voice alerting,2. LED display with 4 simulators can indicate obstacle distance to each sensor,3. Waterproof and shockproof, anti-fault information technology4. More-stable two-angle sensor,horizontal and vertical for detection5. Intelligent identification of the rear obstacles position6. Fit any make of car or vehicle, van, caravan, trailer and horse boxes.7. All kinds of sensor colors andstyles are avaiable8. High quality and easy to install9. Human speaking warning is optional Technical Parameters: 1. Rate voltage 12V 2. Operation voltage range 9-16v 3. Rated current 20-200mA 4. Detecting distance 0-2.5m 5. Working temperature -30 +70 degree 6. Display working temperature 0 +60 degree 7. Ultrasonic Frequency 40HKZPackage Includes:1x LED display monitor