1 Measuring the distance by radar
2 Alarm by three step Bi-Bi sound  
3 4 front sensors and 4 rear sensors are available
4 Full-weather design, un-affected by wind, ice, snow & rain
5 All kinds of sensor colors and styles are available
6 High quality and easy to install

Technical Parameters:
Rated Voltage: 12V DC
Operating Range: 10.5V～ 16V DC
Rated Current: 50mA～ 180mA
Rear Detecting Distance: 0.3～ 2.0m
Front detecting distance: 0.3-1.0m
Ultrasonic Frequency: 40KHz
Display Working Temperature: -30 ～ +70℃