Visible Cool Mist: Ultrasonic technology converts water into a fine mist that is dispersed evenly into the air by a 360-degree nozzle; adds the perfect amount of moisture to any medium-large bedroom or office up to 400 sq. ft. Top-Fill Tank: .97-gallon water tank provides up to 45 hours of runtime per fill; Clean Tank Technology helps protect and clean the tank Adjustable Settings: Adjustable cool mist settings to best fit your space; enjoy the benefits of aromatherapy with 3 included essential oil pads; auto shutoff when out of water Quiet and Convenient: Perfect for nighttime use with whisper-quiet operation, built-in night-light, and auto-shutoff protection when the tank is out of water; includes 1 demineralization cartridge What’s in the Box: (1) Homedics Ultrasonic Humidifier, (1) Instruction Book, (3) Essential Oil Tray Pads, (1) Demineralization Cartridge, (1) 2-Year Warranty