What is the sign of rearview mirror heating?

The three curved arrows in the rectangle are symbols for heating the rearview mirror. The following is the data expansion of rearview mirror heating: 1, weather: rearview mirror heating is generally used in foggy days, rain, snow and frost weather. There is a knob on the left front of the driver's door with several gears, namely L, 0, R and a heating symbol. 2. Model: Not every car will have the rearview mirror heating function. First, check whether there is a rectangular box with three upward arrows (ps: pay attention to distinguish the windshield blowing icon-the fan icon with three upward bending arrows). Second, when heating is needed, press the button or turn to the corresponding gear to start working. Some cars have icons in the rearview mirror. Use time should pay attention to avoid long-term continuous use. 3. Temperature: In fact, the working principle of electric rearview mirror is very simple and the cost is not very high. It is to install an electric heating sheet (electric heating film) in the lenses of the rearview mirrors on both sides. When the owner turns on the electric heating function of the rearview mirror in rainy and snowy weather, the electric heater will quickly heat to a fixed temperature within a few minutes, generally between 35 and 60 degrees Celsius, thus achieving the effects of heating the lens, defogging and defrosting.