What does the MONO button on the air conditioner mean?

[Khloe]

The MONO button in a car's air conditioning system refers to the temperature zone control function. When this button is activated, all air outlet zones will maintain the same temperature setting adjusted by the driver. The MONO button's primary function is to synchronize the passenger side climate settings with the driver's side settings with a single press - this instantly replicates the driver's preferred temperature, fan speed, and other AC settings for the front passenger. Vehicles equipped with dual-zone climate control systems typically feature a passenger control toggle button, though different automakers use various naming conventions for this function (common terms include DUAL, MONO, SYNC, or ZONE). When enabled, the driver can set temperatures for all zones; when disabled, the front passenger can independently adjust their side's temperature.