The Garage Parking Sensor by STKR Concepts is designed to take the guess work out of parking your car in tight garage spaces. It features adjustable, ultrasonic range finding technology to accurately locate your car within your desired parking constraints. The STKR Concepts Garage Parking Sensor mounts easily and quickly to the wall, workbench, shelf, or any surface in front of your vehicle. There is no longer a need to dangle from the ceiling a stringed tennis ball, or mount potentially harmful laser devices. .