Premium Quality: Car parking sensor is made from premium quality materials to ensure durability and longevity. Parking sensor sytem is designed with protective circuits and high quality components to prevent the product from overheating or overloading. Easy to Install: Car reverse sensor kit comes with a 22mm drill bit(hole opener), which is convenient for you to drill holes in the car bumper. There is no need to buy extra drill bits, which saves time. The kit is super simple to install, simply use the picture Instructions for easy installation. 4 Sensors: The reversing sensor kit is installed at the car bumper with 4 sensor system, can anti-freeze and rain proof. When there i s obstacles or danger 0-2.5m, the sensors will BIBI sound to alarm you according to the obstacles distances, also shows you distance data. Keep Safe: Reverseing backup sensor helps to avoid the dangerous and costly collisions behind the wheel and help to provide increased safety for passengers, pedestrians and family members who happen to be back the moving vehicle. Packing List: 1 x main control box, 1 x LED digital display, 4 x sensors with 2.5m line, 1 x hole opener, 1 x power cable 0.8m, 2 x double side sticker, 1 x user manual.