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Title: Perfect
Review: Finally something that works. Tennis balls, tire stops and laser beams all require some sort of adjustment or mounting and they always seem to get in the way when not in use. This thing you just plant it in front of the object you wish not to run into and that's that. No fuss and you can always move it out of the way when working on your car then place it back when done. Even if the battery dies you just watch for any movement of the stop sign then stop.
