3-in-1 Portable Evaporative Air Cooler with Filter Knob for Indoor

-Can be used as an air cooler, humidifier, fan, or air purifier-Performs best in hot or dry climates where humidity levels are below 50%-Ideal for use in home, office, dormitory, and so on-Utilizes a superb honeycomb cooling pad that ensures a high level of cooling-Removable, washable filter for clean air-3 wind speed settings for optimum comfort-2 ice-crystal boxes enhance cooling performance-Easy to operate by turning the knob and buttons-Swing automatically on the left and right-4 caster wheels make it easy to move from room to room