Vicks V3500N Cool Moisture Humidifier... The Vicks V3500N cool moisture humidifier provides soothing, invisible moisture for better personal and room comfort. Maintaining a comfortable humidity helps you breathe better and sleep more comfortably. Self Regulating Evaporative System naturally adjusts output to amount of moisture the air can hold at a particular temperature; Wicking Filter Naturally filters impurities from the water; Scent Pad Heater for soothing menthol vapors; Three speed settings; 1.1 gallon water tank; Runs up to 24 hrs per filling; Great for Medium to Large Rooms.