★ High Quality Design: The parking sensor mainly made out of plastic and alloy in order to make the sensors and sensible parts weatherproof, our parking sensor is sturdy and durable, even under heavy usage. ★ LED Digital Display:Colored LED digital display shows the accurately the distance between the car and obstacle in real time through step by step alarm with LED display. ★ Buzzer Sound:The LED is with inner buzzer sound which has different frequencies depending on the vehicle's distance to obstacle.The closer the obstacles, the louder and faster the sound alert. ★ 4 Sensorsns with high sensitivity: The sensor which can enhance coverage and detection is made of double CPU and advanced chipset and is anti-freeze and rain proof. The sound alert when the 4 sensors detect dangers.Besides, the parking sensor helps to provide increased safety for passengers, pedestrians and family members who happen to be around the moving vehicle. ★ Easy installation: A helpful little tool Hole Saw can help you to install the parking sensor easier.There are a user leaflet and a helpful little tool Hole Saw in the package to help you to install the parking sensor easier.