Car parking sensor
Parking Sensors detect obstacles behind you and also infront of you if you wish, to aid your parking and enable you to get into those tight spots without damaging your car. Using Ultrasonic technology they emit a cone of sound behind your car which bounces of obstacles behind and returns to the sensor, Parking Sensors in action the time taken for these sound waves to bounce and return off obstructions behind your car is how they calculate the remaining distance behind you.
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