Parking Assist: Garage parking sensor, helps ensure the accurate parking position, avoids dents, scratches, collisions and damages, and makes the parking easier and faster.Easy to Use: LED garage parking aid has 3 color indicator lights and sound alarm signals, easy to indicate the distance from the car to the wall. Stop Sign: The green light turns on and sounds a slow frequency alarm when the car is about 2.4m away from the parking device, the yellow light turns on and sounds a medium frequency alarm when the car is about 1.4m away from the parking device, and the red light turns on and sounds a rapid frequency alarm when the car is about 0.45m away from the parking device.Easy Installation: Wall mounted garage park assist alarm, compact and will not take up too much space, easy to install, has a long service life.Wide Applications: The auto stop light is suitable for most vehicles, practical for home garages, underground parking lots, malls, etc. Specification: Product Size: 18.6cmx3.9cmx6cm/7.32inchx1.54inchx2.36inch6cmx8cmx3.05cm/2.36inchx3.15inchx1.20inchMaterial: PlasticBattery: 1x 9V Battery (NOT included) Package Includes: 1 Set Garage Parking Assist Note: Please allow slightly errors 1-2cm differences due to manual measurement.