HREE-STAGE HEPA FILTR - Featured a three-stage filtration system, the purifier is powerful enough to capture dust, pollen, smoke, odor, pet dander, filters particles as small as 0.3 microns and air pollution of PM 2.5. The purifier covers up to 120 sq. ft. AC 120V/60HZ for USA and Canada QUITE OPERATION: The noise level is nearly voiceless at sleep mode with only 30db, its technology reduces noise so you can sleep in a restful and soothing indoor environment FILTER REPLACEMENT REMINDER - When the air purifier detects the filter is saturated, the power indicator will keep flashing in red. You can press the power button for 7s to reset after installing a new filter. 3 FAN SPEED AND 3 TIMER SETTINGS – The 3 timer options (2H/4H/8H) allow you to set the air purifier to run for a specific time, helping you save energy and money, while 3 fan speeds (Low/Med/High) allow you to choose a speed based on different purification needs and size of the room. OZONE FREE - 100% ozone free, does not use UV or ions which produce trace amounts of measurable ozone, a harmful air pollutant. Super energy efficient yet powerful for whole room use.