Is the heating function of rearview mirror useful in rainy days?

Still useful, of course, some models do not have this function.

The heating function of rearview mirror means that when the car is driving in rain, snow, fog and other weather, it can heat the rearview mirror through the electric heating wire embedded behind the lens to ensure the clarity of the lens surface.

The heating of automobile rearview mirrors is generally suitable for rainy and snowy days. When the rearview mirror is heated, the heater behind the lens quickly heats the mirror surface, which can slowly remove the rain or fog on the mirror surface, saving the driver the trouble of frequently wiping the lens manually, thus reducing the danger of driving.