The comfort of warm or cool mist combined with the convenience of a True Top-Fill design that allows you to fill the tank without opening the lid is at the core of the Vornado Mistic 8 Ultrasonic Humidifier. Whole room humidification distributes over 3 gallons of humidity per day up to 700 sq. ft., while included scent pads allow you to 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. The SimpleTank System makes carrying, filling and cleaning the 8-liter tank, well, simple.