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How do I set the fan speed in my TCL Breeva Air Purifier?

Auto mode:

Auto mode automatically measures the air quality in your home and adjusts the fan speed to keep your air truly clean using an advanced air quality detection system featuring a high-precision laser and VOC sensor.

When the air quality is excellent, it operates in the first gear. When the air quality is medium, it operates in the second gear, and when the air quality is poor, it operates in the third gear.

Manual mode:

You can also adjust the wind speed to reduce or increase the airflow to purify the room air.

While powered on, press the wind speed button in the following order:

Sleep > 1st gear > 2nd gear > 3rd gear > Automatic.