Auto Sensor Max Detect Range: 1.5m/Custom-made, Transmitting Frequency: 40kHZ, Excellent Quality and Reasable Cost Auto SensorFeatures:-Reversed LED Display ... , the closer the obstacle, the faster the beep frequency,-Rated Voltage: DC12V,-Operating Temperature: -40°C to +85°C,-Max ... :5 status,-System activates automatically when reverse gear is engaged, High quality and reasonable price Auto sensor