Rear window and outside mirror defroster/windshield deicer (if so equipped) switch

Rear window and outside mirror defroster/windshield deicer (if so equipped) 
switch  - Instruments and controls - Infiniti QX Owners Manual - Infiniti QX

See also:

Using the system
Initialization When the ignition switch is placed in the ON position, INFINITI Voice Recognition is initialized, which takes a few seconds. When completed, the system is ready to accept voice command ...

Tow mode switch
TOW MODE should be used when pulling a heavy trailer or hauling a heavy load. Driving the vehicle in TOW MODE with no trailer/load or light trailer/light load will not cause any damage. Howe ...

Instrument panel
Instrument panel 1. Side ventilator2. Meters and gauges3. Center ventilator4. Audio system5. Clock6. Center multi-function control panel— Navigation system* ( i f so equipped)— Vehicle information ...