What is the transparent line in the camera behind the truck?

This is a video transmission cable. The transparent wire in the camera behind the truck is a cable for video signal transmission, which consists of tiny copper wires or optical fibers. It is transparent and easy to observe and install. Its function is to transmit the image signal shot by the camera to the display or monitor in the car, so that the driver can observe the situation behind the car through the display and improve the driving safety and convenience.