?4-Layer Filtration? Equipped with a honeycomb activated carbon filter and a high efficiency HEPA filter, capture up to 99.97% of particles by 0.3 micron, filtering pollutants such as soot, bacteria, allergens, PM2.5, hair, pollen, pet dander, etc., greatly improve the air quality of your indoor environment, ideal for daily use in home, office, kitchen , baby room, with an area of ??15-25m². ?4 Purification Modes & 3 Timing Features? 4 Purification Modes, Automatic / Medium Speed ??/ High Speed ??/ Sleep, you can adjust the cleaning performance according to the air quality, Auto mode will recommend the speed of the fan by detecting the quality of the ambient air. Sleep mode ensures a peaceful sleep environment, the timer allows the air purifier to turn on or off automatically after 1, 4, 8 hours. ?Negative Ion Generator? Releases 5 million / cm³ of high-concentration oxygen-negative ions, able to deposit the remaining particles in the air while destroying bacteria and improving air quality. In addition, negative ions can promote human metabolism, improve lung function, relieve fatigue and improve sleep, improve overall health, it is independently controlled and it can be turned on and off as needed. ?Air Quality Indicator? Intelligent air quality sensor technology quickly measures the air quality of your home. The air purifier has a built-in replacement filter reminder timer. Once the purifier has been used for 2,000 hours, a replacement reminder will remind you that the light will come on when the purifier filter needs to be replaced. ?2 Year Warranty and Life Support? We offer 30 day unconditional refund, 2 year warranty and lifetime support for this air purifier. If you have any questions, do not hesitate to contact us and we will provide you with a friendly service. The replacement filter for this air purifier can be purchased at this store or please search directly for B07P6GQJXQ.