1.No display,with simple buzzer alarm(voice adjustable model can be optional)                                                            

2.Measuring the distance by sensors,with detected distance 0.3-2.0m for rear
3.Alarm by three step Bi-Bi sound 
4.can work with 2 or 4 sensors for car rear, and with 6 or 8 sensors for rear and front.    
5.sensors can add waterproof connector,easy to replace when defective                                          

6.Full-weather design, un-affected by wind, ice, snow & rain
7.Working Voltage: 12V DC                                                                  

8.Working Temperature: -40 ～ +80℃