Reversing parking sensor set buzzer 4 sensors white

The set includes: 4 detectors (sensors) white, buzzer - emitting sound signals, central unit, hole saw to drill holes in the bumper. Assembly instructions Buzzer can work in 3 sound modes: high, low and completely muted. Changing the mode with a switch on the housing. The parking sensor is a device that supports parking and reversing the car. It works on the principle of sonar - it emits ultrasonic waves, which, when reflected from an obstacle, allow you to determine what distance separates the car from the obstacle. When reversing, the device correctly recognizes obstacles in the way of the vehicle and warns the driver with a sound. Full Specification: Operating Range/Sensitivity 0-2.5m Power Supply 12V Operating Frequency 40KHz Operating Temperature -30°C - +70°C Mounting Diameter 22mm