Ideal for rooms sized up to 500 sq. ft. Activated filters removed pathogens. Germ-killing UV lamp. Auto mode operation adjusts settings according to the pollution level. Indicator lets you know when it is time to change filters. You shouldn't have to think about the process of breathing, but the Surround Air Multi-Tech 8500 6-in-1 Air Purifier will make you appreciate the cleanest air you've ever inhaled. This air purifier six technologies for filtering nearly every type of pollutant. A true HEPA filter eliminates dust and allergens. Odors and many types of chemicals are removed with the activated carbon filter. The UV lamp kills germs and the bulb lasts more over three years. A photocatalytic filter gets rid of VOC's and certain kinds of bacteria. The indicator reminds you when it's time to change the filters and the auto mode operation allows you to adjust the settings on the filters to match the level of pollution in the air.