Ideal for any medium sized room. 3-in-1 compound HEPA filter is designed to reduce 99.97% of allergens, pollution and odors. Great for capturing or minimizing allergens in the air including pet dander, smoke and lingering odors. Three-stage fan control to circulate air flow. Negative ion function reduces airborne bacteria. Sleep mode provides a lower speed fan and reduced noise level so you can sleep well through the night. Adjustable timers settings at one, two, four and eight-hour increments. Convenient child-safe lock. Indicator light when it's time to change filter. Filter lasts for up to 720 hours of usage.