Efficiency Filtration System: Our HEPA Air Purifier features an efficient filtration system, powerful enough to captures up dust, pollen, smoke, odor, pet dander. It can filter particles as small as 0.3 microns and air pollution of PM 2.5, eliminate 99.97% tiny objects in an indoor environment of 215sq.ft (20m³). Air Filter With Fragrance Sponge: Add a drop of essential oil (Not Included) and some water into the sponge below the filter air outlet, then fragrance will flow with air movements. (Such as Citrus, Honeydew Melon, Musk, Vanilla, Orris or Vetiver) Ultra-Quiet: Thanks to the new brushless motor, the air purifier can operate at a decibel as low as 22db when working., it makes air cleaner lightweight and quiet, no annoying sound, not affect your work, sleep or study, suitable for use at night and in small spaces. Portable and Energy-Saving: Lighter weight (3.31lb), smaller size 6.3*6.3*9.3 inch) and 180-degree folding (space-saving) design make our fan more lightweight and portable, saving a lot of backpack space. Running in low power makes it a winner for energy-saving. How can you figure out a reason for not having it? Important: The replacement filter should be replaced every 3-6 months depending on the air quality in your area and use of the Air Purifier to ensure the best results. Note: please remove the plastic bag of the HEPA filter before running the air purifier.