... 64 kindsdisplay distance: 0.3-2msensor theory: ultrasonic sensoralarm distance: 0.3-2.5msensor line ... . Alarm voice: >80dB at 10 cm.Ultrasonic frequency: 40KHz. 4.Packing of products:corlor ... Parking distance control,parking sensor system,parking sensor,camera parking system,video parking system,video parking radar,camera parking sensor,distance control,car distance radar,car protecting system,car radar ...