This is the air purifier that monitors air quality and automatically adjusts its cleaning settings in response to pollutant levels. Integrated particle and gas sensors monitor air impurity levels and automatically increase the speed of the fan to remove allergens, tobacco smoke, and volatile organic compounds (VOCs). Its three-stage filter system uses mechanical and electrostatic filtration to eliminate 99.97% of particles as minute as 0.1 microns, including mold spores, pet dander, and unpleasant odors. The air purifier has 240 clean air delivery rate for tobacco smoke, dust, and pollen, and cleans the air in a 365' sq. room five times in an hour. On high, the air purifier generates only 52 decibels - lower than normal conversation volume - and users can also manually select one of three cleaning speeds. An LCD shows pollutant levels, fan speed, and remaining filter life, and four casters enable easy relocation. Includes remote control and one filter (additional filters sold below). 23" L x 20 W x 11" D. (33 lbs.)