This is the warm mist humidifier that also purifiers air and provides a clean and comfortable environment. The humidifier distributes warm mist that evaporates once it is blown into the air, improving air moisture with sauna-like technology. Intended for rooms up to 1000' sq., the unit has three mist settings and a 135-oz. water tank that allows it to run for up to 20 consecutive hours before requiring a refill. It also helps clean the air with a built-in air purifier that removes allergy-provoking dust, pet dander, smoke, and pollen and reduces the discharge of white dust typically produced by ultrasonic humidifiers. Its multi-filter system contains a plasma generator that produces both positive and negative ions to generate Hydroxyl (OH), which inactivates airborne particles and viruses by robbing them of hydrogen. It also has a HEPA filter and digital display. AC plug. 16 1/2" H x 10 1/2" Diameter. (9 lbs.)