Vehicles these days are shipped without a window visor attached.
It prevents rainwater from leaking in during rainy weather
Also, It's good when you ventilate of the vehicle interior in winter.
It can also prevent the car temperature from rising in hot summer.
However, there is a disadvantage that wind noise occurs when driving at high speed.
Since it is cheap and has many advantages, it is recommended to install a window visor :)
There are two types of window visors, chrome and smoke.