2BLACK SENSORS P2 20mm PARKING ASSISTS
WITH CONTROL BOX 2 SENSORS AND STANDARD BUZZER 
General Specification:
Working Voltage: 10V to 15V
Working Temperature: -20°C ~ 80°C
Current Consumption: <100mA
Accoustic Volume: >85dB at 10cm
Response Time: 300ms
Ultrasonic Frequency: 40KHz

Features:
Audible Distance Indication
1.5-0.80m: Bi, Bi, Bi, Bi
0.80-0.40m: Bi Bi Bi Bi
(The closer the faster)
0.40-0m: Biiiiiiiiiiiiiiii 
(Solid beeping)