Yescom 6-Stage Living Air Purifier Cleaner Hepa Ionic Ozone UV Generator Smoke Filter 6 stages of purification: negative ionization, dual ozone plates, UV light, photo-catalytic filter, HEPA filter, activated carbon filtration Washable filters and purification plate Variable speed motor to control the O3, ionization& UV fan speech Stainless steel and solid wood cabinetry, neat and attractive appearance Plate receiver slot allows insertion and removal of ceramic plates for cleaning