When you start to reverse, the system sends out sonar cones, sensing any obstacles behind your car. Four separate sensors provide the widest possible sensing. When an obstacle is sensed, the speaker emits beeps that get quicker as the obstacle gets closer and the wireless digital readout gives the exact distance to the obstacle. Sensors adhere to rear bumper with industrial doubled-sided tape and connect to a transmitter mounted in the cargo area. Just plug the wireless digital readout into your lighter socket to see the exact distance from an obstacle. More details about product Wireless Back-Up Sensor
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