Honeywell HUT-102M Quietcare Ultrasonic Mini Tower Humidifier Ultra-quiet humidifier uses ultrasonic technology to silently provide visible cool moisture 1.2-gallon-output-per-day; runs up to 12 hours per filling; ideal for rooms up to 350 square feet Illuminated tank window allows visibility to water level and doubles as a nightlight Auto shut-off when tank is out of water, variable moisture settings Measures 10 by 7 by 15 inches; backed by 5-year warranty