3-in-1 True HEPA Filter: MSB3 Air Purifier features a 3-stage filtration design: Pre-Filter - Captures Hair, Pet Dander and Fiber; TRUE HEPA Filter - Captures Smoke, Allergens, Dust, Pollen; Activated Carbon Filter - Quickly captures and neutralizes Bad Smells, Pet Odor and VOC to freshen the air quality.Filtration Performance: MSB3 Air Purifier uses True HEPA PP electrostatic electret melt-blown filter. Filters out 99.97% of particles as small as 0.3 microns and air pollution PM 2.5 (particulate matter). Helps to relieve common allergies like sneezing, coughing, and irritated eyes.Minimalist & Quiet: MSB3 Small Air Purifier adopts One-touch operation: 1.High speed - 2.Low speed - 3.Sleep mode - 4.Off. Equipped with variable indicator light and filter replacement reminder function. Our Desktop Air Purifier using the latest DC brushless motor for high airflow and low noise, 27 dB in sleep or quiet mode.Safe & Reliable: 100% Ozone Free Air Cleaner. Certified to FCC, CE, RoHS.