The Levoit Core 400S-P Smart Air Purifier, is the efficienct air purifier to clean a whole room properly. AirSight Plus technology scans the surrounding air for airborne particles as small as 0.3um, this air purifier focuses on real-time home conditions - this is more than just having an air purifier. Levoit engineers designed the air purifier's internal structure to provide powerful air purification while maintaining noise levels as low as 24dB. Features: Intelligently purifies the air in a 1733 sq ft room per hour An Efficient Middle Filter helps create a cleaner, healthier home - Our air purifiers are scientifically proven to capture particles as small as 0.3 microns including pollen, dust and more. 360° filtration system uses activated carbon to remove gases and odors and a Efficient Middle Filter to capture 99.97% pollutants as small as 0.3 microns. Automatically senses and reacts to changes in air quality - then reports pollution in real time on LCD screen and on your free VeSync Link app. In the sleep mode, the air purifier monitors and purifies using the quiet settings, with a dimmed display and can be totally turned off. Program your machine to turn off after pre-set intervals between 1 -12 hours. Safe and easy to clean with low maintenance, easy-to-replace filters. With built-in notifications when they require replacing. Using compatible voice control services, control your air purifier with simple, spoken instructions. Works with Alexa and Googlevoice Assistant. Choose from a variety of replacement filters to best meet your needs. The Toxin Absorber Filter specializes in smog, toxins, and VOCs, while the Smoke Remover filter addresses smoke from wildfires, smoke, and other particulates. The Pet Allergy Filter captures fur and absorbs unpleasant odors. Warning – unauthorized replacement filters are not tested. Only authentic Levoit filters are recommended to ensure a sealed system and proper functioning of the machine. The official Levoit Core 400S replacement filter can be found by searching "B08SQQK6K7" in the search bar.