Plastic - Yes - 18.8 millimeters - Back Up Sensors

The most common vehicle reversing aid is an audible sensor system. Back up sensors install in the rear bumper and have a speaker that changes beeps as your close in on an obstruction.

Backup sensors are motion activated detectors that alert drivers and/or pedestrians, by beeping/chirping when objects are too close behind a particular vehicle in reverse. These sensors are often utilized in conjunction with a wide angle camera, LCD monitor, or LED display.

Metra TE-BSDK Blind Spot Detection Kit

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$179.99
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Two collision sensors with two ultrasonic proximity sensors offer greater sensitivity and reduce false alarm

The four-wire connection topology makes the installation and setup process a breeze

All connections are made waterproof to prevent equipment from water damage, whether it is rainy season or the vehicle goes for a wash

The kit come complete with mounting hardware and connecting wires

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