Micro-filter removes particles as small as 0.1 microns including smoke, dust, pollen and virtually all airborne allergens. Quiet, powerful airflow. Easy to use controls with 3-speed fan and power light indicator. Portable design is easy to move from room to room, for desktop or table top use. Separate ionizer switch. Filter change indicator alerts user when to change filter. Drop in filter pack results in easy filter changing without moving the unit. 5-year warranty on motor, 1-year parts and labor.