Parking Assist: Garage parking sensor helps ensure accurate parking position, avoids dents, scratches, collisions and damages, making parking easier and faster. Easy to Use: LED garage parking aid features 3 color indicator lights and sound alarm signals to clearly indicate the distance from the car to the wall. Stop Sign: Green light activates with a slow frequency alarm when the car is approximately 2.4m from the device; yellow light activates with a medium frequency alarm at about 1.4m; red light activates with a rapid frequency alarm at approximately 0.45m. Easy Installation: Wall-mounted garage parking assist alarm is compact, space-saving, simple to install, and designed for long-term use. Wide Applications: Suitable for most vehicles and ideal for home garages, underground parking lots, malls, and similar environments. Specification: Product Size: 18.6cm x 3.9cm x 6cm / 7.32in x 1.54in x 2.36in 6cm x 8cm x 3.05cm / 2.36in x 3.15in x 1.20in Material: Plastic Battery: 1 x 9V Battery (NOT included) Package Includes: 1 Set Garage Parking Assist Note: Please allow slight variations of 1-2cm due to manual measurement.