The ultrasonic membrane of the TotalComfort® Humidifier converts water into a fine mist that is dispersed evenly into the air. This leak-resistant humidifier uses a UV-C LED to reduce bacteria, mold, and fungus that may be in the humidifier's mist; use in spaces up to 278 square feet. The Clean reminder lets you know when to clean the ultrasonic membrane so your humidifier works like new. The 0.97-gallon water tank has a carry handle and provides up to 45 hours of runtime per fill. Adjustable Settings: Choose from three mist settings and enjoy the benefits of aromatherapy with three included essential oil pads. Features a built-in night light and auto-shutoff for nighttime use. Includes Instruction Book, three Essential Oil Pads and Demineralization Cartridge.