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I work at our dealership and it's a module we sell to put on cars. It's actually very important when it comes to getting a bad drivers attention to get him to stop. It just adds more saftey to the vehicle and yourself. And it actually will always give you an advantage when it comes to insurance purposes if you ever get rear ended with it on. I personally have one on my car but not on my third brake light. I connected it to my reverse lights
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