... Detect Range: 1.5m/Custom-made, Transmitting Frequency: 40kHZ, Excellent Quality and Reasable Cost Auto SensorFeatures:-Reversed LED Display indicates ... the obstacle, the faster the beep frequency,-Rated Voltage: DC12V,-Operating Temperature: -40°C to +85°C,-Max Detect Range: ... 1.5m/Custom-made,-Transmitting Frequency: 40kHZ,-Buzzer Sound Pressure ...