The Ultra3 Ultrasonic Vortex Humidifier is a uniquely effective way to create a comfortable, perfectly humidified living space. Vornado's deep pitch blades pull large volumes of harsh, dry air through the unit, and then, using Vornado's signature Vortex Action, circulates the humidified air throughout the room, providing complete and uniform humidification in spaces up to 600 sq. ft. Ultrasonic technology shatters water into a fine, visible mist that is circulated throughout the room using Vortex Action. The Ultra3 has an on-board humidistat to automatically regulate moisture output, or can be set to run continuously for maximum humidity output. The push-button controls with LED lights provide easy confirmation of current settings. Three fan settings are available - High, Low or Auto. In Auto mode, the fan and ultrasonic transducer will intelligently adjust up or down to maintain the set humidity level. The included mineral cartridge softens the water, reducing mineral buildup. 1 gallon capacity. 2 gallon output every 24 hours. The Ultra3 is backed with a 5 year limited warranty to ensure years of reliable use.