English 
speedometer display on windshield
That is the head up display function, abbreviated as HUD, also known as parallel display system, which refers to the driver centered, blind operated and multi-functional instrument panel. Its function is to project important driving information such as speed and navigation onto the windshield in front of the driver, so that the driver can see important driving information such as speed and navigation without bending or turning his head.
Some brands of low configuration cars do not have a head up display, while high configuration cars have a head up display. If you need this function, you can buy a high configuration model or spend money to install it. Some brand models do not have head up display function, and some riders also want to install it. However, it is not recommended to install this part of riders. Some HUD products on the market are inconvenient to use and may affect driving safety. Some later installed head up display devices need to be connected to the OBD interface of the vehicle in order to read data such as vehicle speed and engine speed. This head up display can't display navigation information and has little impact. Most of it can only display vehicle speed and vehicle speed. Therefore, it is not recommended for riders to install it. When driving at ordinary times, you should look ahead and see as far as possible. If there is an accident or other situation ahead, it can react quickly.
When driving, don't follow the bus, truck and van, as it will block your view.Some brand models do not have head up display function, and some riders also want to install it. However, it is not recommended that these riders install such vehicles. Some head up display products on the market are not convenient to use, and may also affect the driving safety factor. Some of the later installed head up display devices basically need to be connected to the OBD interface of the vehicle, so that the vehicle speed, engine speed and other data can be read. This kind of head up display can not display navigation information, and its function is very small. Most of it can only display vehicle speed and rotational speed. Therefore, I do not encourage you to install it.
Get a Quote / Info