Ideal for any medium sized room. Great for capturing or minimizing allergens in the air including pet dander, smoke and lingering odors. The 3-in-1 compound HEPA filter is designed to reduce 99.97% of allergens, pollution and odors. Negative ion function reduces airborne bacteria. Four-stage fan control to circulate air flow with additional sleep mode for reduced noise level. Adjustable timers settings at one, two, four and eight-hour increments. Convenient light indicators notify you when child safety lock is on or filter needs replacement. Filter lasts for up to 720 hours of usage. Filter included.