... ; 3. Full-weather design, un-affected by wind, ice, snow Buzzer Car Parking SensorModel: PST-PSB3920Specifications: Measuring the distance by radarAlarm ... are availableHigh,Low,Off three step switch for buzzer and interface with the buzzer wireFull-weather design, un-affected by wind, ice ... .3~ 1.5mUltrasonic Frequency: 40KHzDisplay Working Temperature: -30 ~ +70°C Buzzer Car Parking Sensor