The Vornado Mistic 6 Ultrasonic Humidifier gives you the comfort of warm or cool mist with the convenience of a True Top-Fill design that allows you to fill the tank without opening the lid. Whole room humidification distributes over 3 gallons of humidity per day (up to 700 sq. ft.), and with the included scent pads you can enjoy aromatherapy with your favorite essential oils. The built-in humidistat maintains your set comfort level, and the Humidity Indicator Light let's you read the room. With the SimpleTank System we made carrying, filling and cleaning the 6-liter tank, well, simple.