Automatically detects obstacles behind the car when reversing, automatically turns on and on. | Crescent moon shaped LED heartbeat display function step by step, audio + digital instructions step by step. | Intelligent microcomputer control, accurate digital display of obstacle distance, derived from military technology, accurate and reliable. | The high brightness sound + LED distance message is not affected by the environment, especially in rainy days and nights. | The probe adopts built-in installation, multi-color configuration, the sensor is refined and compact, and is easy to install.