purezone elite 4 in 1 true hepa air purifier ca peairtwrPureZone Elite safely cleans the air in your home or office making it more breathable, enjoyable and healthier. The sleek, modern design complements any decor and features a sleep mode for clean air while you and your family sleep, three speed settings and an automatic two , four , or eight hour timer to conserve energy and extend the life of the air filters. The filter reset indicator lets you know when its time to change the Active Carbon Pre Filter