Quote Originally Posted by BestRadarDetectors View Post
They work by transmitting laser and judging a distance by the return beam. Depending on how low your heads are installed the transmit might be too low to reflect off the objects in front of you. If you want to test and adjust the sensitivity on them test them against a wall or a garage door.
They are above bumper height on a Passat so fairly standard height and I made sure they were level both directions. I assumed it had to do with the reflections, to be honest I really could care less about the parking aspect more about the Laser Jamming lol.