What is the rear button in the car?

[PhoebeAnn]

The rear button in the car is the rear window defogger switch. On the rear windshield of the car, you will see many copper wires, which are the heating elements. By pressing the rear button, you can activate the rear window heating elements to defog the window. Typically, the rear window defogger switch will automatically turn off after about ten minutes to protect these heating elements. When the windshield heating switch is turned on, the fog on the rear windshield will usually disappear in about a minute. If the defogging effect is not ideal after turning on the rear window defogger, it may be due to aging from prolonged use.