Air quality detector

5 fan speeds + auto mode (automatically selects fan speed based on air quality)

Filter replacement indicator

Up to 9 hours off timer

Convenient filter access for easy replacement

Sleep mode

Control lock

Activated carbon pre-filter: removes household odors

VOC (formaldehyde) filter: formaldehyde and other VOCs can be found in building materials， foam insulation， household products and fuel-burning appliances， they can prompt headaches， vomiting， rashes， asthma attacks and some are suspected to cause cancer， AC-2221 VOC honeycomb filter effectively removes formaldehyde， toluene and VOC， factory tested: VOC removal efficiency reaches 95%， under the following conditions: 1m3 test room; initial concentration: 1.9-2 mg/m3; 4 hours testing

HEPA filter: a high-efficiency air filter that captures 99.5% of airborne pollutant particles as small as 0.3 microns， including spores， pollen， mold， pet dander and dust