
Hoppy Ultrasonic Back-Up Sensor Hoppy Ultrasonic Back-Up Sensor. The Hoppy Ultrasonic Back-Up Sensor identifies objects in the detection zone as your vehicle approaches the object (up to 6.5' of vehicle bumper). An alarm sound increases in intensity as the object moves closer. The digital display shows the distance to the nearest object behind the vehicle. Two advanced ultrasonic sensors, audible alarm & digital display. Installs in approximately 30 minutes, No wires necessary! Operates in rain & snow, day or night.
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