1.It is wireless between 4.3 inch LCD Monitor and Main box, the camera connect to the main box,no need to run wire from car front to rear,easy to install   
2.2.4G wireless external receiver for the monitor and external transmitterm for the control box   
3.Display the optical image by a rearview camera equipped at car rear bumper,the diameter is 18mm.The camera also can be changed with the other cameras.                                                  

4.Measuring the distance by sensors,the detected distance can be 0.3-2.0m,
5.The distance and rear videos are showed on the 4.3 inch TFT LCD Monitor,which is sticked on the dashboard in car driving room.The monitor can be changed by other monitors                                                                                                    

6.Alarm by three step Bi Bi sound,voice alarm is optional.                                             
7.sensors can add waterproof connector,easy to replace when defective