Lorell 240 Air Purifier - White Breathe clean, refreshing air using the 240 Air Purifier. It features continuous smart monitoring so its Real Time Air Quality Indicator lets you know the current air-quality level. Using a 4-In-1 True Filter, the air purifier removes 99 percent of in one hour, 99 percent of 2.5 micron particulate matter in one hour and 95 percent of formaldehyde in 4 hours. When in Auto Wind Mode, the fan speed adjusts to low, medium, high or turbo according to air quality detected by the dust sensor. Convenient timer lets you run the device 1 hour, 2 hours, 4 hours or 8 hours before the air purifier automatically shuts off. Air purifier operates silently.