3 IN 1 air purifier for home: True HEPA air Filter reduces up to 99.97% of harmful germs, dust, pollen, pet dander, mold spores, and other allergens as small as.3 microns from the air Traps allergens: pre filter traps dust, pet hair, and other large particles while extending the life of the HEPA filter Reduces odors: activated charcoal filter helps to reduce unwanted odors from pets, smoke, cooking fumes, and more Quiet operation: the lowest setting can be used as gentle white noise at night for a quiet, restful sleep Settings: 3 Speed settings, programmable timer (up to 8 hours), and an optional ionizer