The main functions of USB interface on the vehicle are: using the standard power supply on the vehicle, using USB as an interface to charge electrical appliances, or using it as a fixed power supply interface. USB interface is a vehicle-mounted transmission line, which has the advantages of fast transmission speed, convenient use, hot plug support, flexible connection and independent power supply. Generally, it is a universal interface for USB devices such as USB flash drive and MP3.

The usb interface in the car can be used for: listening to songs by inserting a USB flash drive, supplying power to mobile phones, charging MP3, making USB car cigarette lighter interface, making electronic dog and driving recorder interface, and charging computers and tablets.