DESC: 99.97% effective. Reduces common household odors, including pet odors, up to 30% better than other leading brands. Clean Air Delivery Rates of 101 smoke, 120 dust, and 120 pollen. With separate carbon pre-filter, ionizer, and three speed fan. Filter change reminders. Portable, compact design is ideal for floor or bookshelf use. Whisper-Quiet Hunter Fan draws air into the unit without the noise associated with many competitive models