Advanced 4-stage filtration system: True Air Purifier, a combination of pre-filter, true filter, honeycomb activated carbon filter, and sterilization cotton that works efficiently and smoothly to reduce 99.97% of particles in the air as small as 0.3 microns, including dust, pollen, smoke, odors, mold spores and pet dander. what a small or medium-sized room up to 20 square meters. Quiet: Low-noise design for suspension mode as lush as 28dB without disturbing the night. You'll be hugged by fresh, clean air as you sleep. The air filter is equipped with a night light that can be adjusted from low to high brightness depending on the sleeping environment needed. Can be turned off if the light is light sensitive. Three speeds and automatic shut-off timer: three fan speeds, sleep mode (<20 db, CADR 90 m/h), daily mode (< 35 dB, CADR 108 m/h) and filtration mode strong (< 50 dB, 128 m/h) for your choice according to different purification needs. It can also automatically shut off after 2/4/8 hours by timer setting. Bring healthy and safe sleep to your family. Air purifier with aromatherapy: The lower part of the air purifier is designed with a spice box that can be added with essential oils. Air purifier with 2 pads of essential oil that revitalizes the room with (essential oils not included) Filter Replacement Reminder: Filter life is about 2000 hours and we suggest changing the filter every 3-6 months depending on usage frequency and air quality. The negative ion" button flashes quickly to remind you to change the filter. We recommend that you use an original replacement filter to maintain the best performance of the air purifier. Search Asin: B084MJVGWN the filter replacement. "