Dreval D-950 Air Purifier True HEPA Filter Humidifier UV Light Negative Ion Generator Combo - Best Air Cleaner to Protect Against Allergens Dust Pollen and Mold - Built in Odor Sensor Air purification system does everything you need to keep breathing air in your home clean and healthy Combination of multiple filters insures effective filtration of airborne pollutants up to 99.9% Odor Sensor detects pollutants and odors and adjusts fan speed to changing air quality Builtin features ultrasonic humidifier; negative ion generator and UV lamp for specific purification Extremely quiet operation designed to maintain peaceful environment while purifying large rooms