Vornado�s signature Vortex Action has been incorporated with Ultrasonic Humidifier Technology, maximizing humidity distribution. All Ultrasonic humidifiers use ultrasonic frequency to break water into microscopic droplets - but this is where most humidifiers stop. A Vornado humidifier creates a Vortex beam of air to quietly propel the moisture out into the room for true Whole Room Humidification. User-defined settings allow you to choose your desired humidity level and fan speed via push button controls with LCD screen. The humidistat provides automatic humidity control and the large 2 gallon capacity reduces refills. The included mineral cartridge softens the water, reducing mineral buildup. Provides coverage up to 900 sq. ft. 5 year limited warranty.The Vornado Ultrasonic Whole Room Humidifier definitely does not disappoint anyone at all.