The filter features active carbon for absorbing harmful pollutant, as well as a self cleaning function which decomposes and eliminates them with LED light using the photocatalytic technology. This cycle of operation allows the filter to restore itself and achieve long service life. FL-C120 consists of 2 layers: 1) HEPA type filter (for dust, pet hair, PM2.5, pollen, bacteria, virus, mites, mold) 2) Self-cleaning active carbon filter (for VOC, smoke, odour, chemicals) Specifications Filter for cado air purifier LEAF 120 (AP-C120): sold separately 2 Layer filter: HEPA type filter and self-cleaning active carbon filter Capturable substances: PM 2.5, dust, pollen, pet danders, tobacco smoke, VOC, formaldehyde, etc. No ozone is emitted Filter life is 6 months to 1 year Dimensions: 20 x 20 x 12 cm Weight: 400 g Colour: White