Bionaire BU2200-U Revolution Ultrasonic Humidifier Ultrasonic humidifier from Bionaire for medium-sized rooms; quiet operation Shatter-resistant water tank; microban protection cartridge combats germs and white dust Push-button high and low output settings; 12 hours mist production per full tank Color-coded backlight informs of current humidity levels and blinks when water runs low Humidifier weighs 18 pounds upon shipping; limited 2-year warranty