SANDETOUN car radar system is equipped with 4 auto Car Rada Sensors. It can Automatically detects obstacles behind the vehicle when reversing, LED display function, digital and voice prompts. All detectors are waterproof, high/low temperature, weathering and cracking resistant. Wide working range and 2.4m working distance ensure your astern and travel safety. As the distance gets closer, beep warnings will become more frequent. Prevent potencial dangerous and collisions. The LED Display with 3 colors can both shows distance data and warn you with beep sound. Beep sound warning will be more frequent when distance is getting closer. The combination of digital data and Beep sound design gives you a double guarantee of travel. The control box is designed with protective circuits and high quality components to prevent the product from overheating or overloading. Strong anti-interference ability and durablity DETAILS： Operating voltage: DC12V Operating voltage range :DC10V-16V Working current :8-10A Operating temperature :-30-70C Display distance :0-2.4M Ultrasonic frequency :40KHZ LED display (Red, yellow, green) The three stages showed that the closer you got to the obstacle, the faster the beep frequency Cable length of sound alarm indicator :5.2M Main control box size :70CM*50CM*21CM Sensor waterproof class :3P