About this item (): From October 2022 through September 2024, 3% of the purchase price of every (Levoit)RED product will go to the Global Fund to fight AIDS with (RED), with a minimum guaranteed donation of Dollar 200,000. : The top-performing (Levoit)RED Core 400S Smart Air Purifier can purify large rooms, such as bedrooms, living rooms, kitchens, and basements. Purify a 403 ft² room 5x per hour and a 990 ft² room 2x per hour.- : Premium filtration includes a Pre-Filter, an Efficient Middle Filter, which traps viruses, bacteria, pollen, fine dust, and pet dander, and a Custom High-Efficiency Activated Carbon Filter that helps neutralize household odors, smoke, and VOCs.- : Keep the Core 400S running throughout the night and reduce symptoms caused by allergens such as coughing and sneezing. Use Sleep Mode for the lowest fan speed (24 dB) to create a sleep-friendly space that’s as quiet as falling leaves. : The laser dust sensor scans the surrounding air for airborne particles, continuously updating the PM2.5 display and creating graphs in the VeSync app so you can see how your air quality has improved.- : Caring for babies and children, or playing with pets. : Program the air purifier to use different air purifier modes and fan speeds at certain times, so you can have your week planned in advance. You’ll never have to worry about forgetting to change the settings. & : The Core 400S is Energy Star and FCC certified, ETL listed, and a recipient of the German Design Award (2021) and iF Design Award (2021). Only use official Levoit replacement filters for best results.