Vornado Ultra3 Whole Room Ultrasonic Humidifier Humidifies up to 600 sq. ft. through the use of vortex circulation Electronic humidistat for automatic humidity control and 3 fan settings (low, high, auto) Push-button controls with LED lights for easy confirmation of settings 1 gallon tank capacity and up to 2 gallon output every 24 hours Backed by a 5-year limited warranty