UV Bulb - helps remove airborne germs3, bacteria and other microorganisms that are exposed to the short ultra-violet wavelengths. -UV/TiO2 On/Off Controls - for use during flu season and all-year-round turn it on to help remove bacteria and germs3 from air passing through the screen under UV light. -Timer - set it and forget it for up to 8 hours with automatic shut off. -Rinsable Pre-Filter - this first line of defense in the multi-stage filtration system catches lint, pet hair, and other large particles so the filter made with HEPA media can do its job of capturing the smallest particles. -Ionizer - helps eliminate household odors and trap airborne dust, pollen, and germs. -3 Speed Fan - easily adjusts for multiple levels of cleaning power. -Change Filter LED Indicator - no need for guessing - it illuminates when it is time to change the filter, made with HEPA media.