Ture HEPA Technology Energy saving: 3 levels of adjustable fan speed About this item * 3-in-1 Air Purifiers: 3 stage air filtration system for home in 1 air purifier. Pre-filter captures large particles such as dust and pet hair. True HEPA filter captures 99.97% of pollutants. Removes common odors caused by smoke, pets, cooking, dorm room smells. It takes the initiative to capture harmful substances in the air, while traditional air purifiers use fans to extract air * 3 Fan Speeds & Easy Operation: Switch between Low/Mid/High purification speeds with only one button. Set up in few seconds without waiting. Press one time to turn on the purifier and the low-speed mode is automatically on. Press two or three times to switch among middle and high fan speed <