Perfect Function The reversing sensor system is installed on the car rear hood with 4 sensor systems, which can resist frost and rain. Dual CPU and advanced chipset for coverage and detection improved. there are obstacles or danger within 0-2.5M, the sensors will make BIBI sound to alert you according to the distances of the obstacles Premium QualityThe car parking sensor is made of high quality material for good durability and long service life. Radar system is designed with high quality protection circuit and components to prevent overheating or overloading. Dont worry about rain or snow getting into the sensors and freezing Easy to InstallDrill bits and double-sided tape are provided in the package for easy drilling and fixing. A user guide is included, so it is not difficult to install it by hand Safety GuaranteeHigh quality sensor system with protection circuits preventing overheating or overcharging. Reverse Parking Assist helps avoid dangerous and costly collisions while driving and provides increased safety for passengers, pedestrians and family members around the moving vehicle Product Color:Black Description: Features: Material: plastic Item Type: Parking Aid Color: silver, white, black (optional) Weight: approx. 172g Package included: 1*4pcs/Set Radar Sensors Note: 1. It is easy to install, but professional installation is highly recommended.