The 120-hour* ultrasonic features an easy to fill large 7.57 L (2 gal.) tank. This humidifier features Silver Clean™ protection in the tank to fight the growth of mould and mildew on the surface of the water tank. Thanks to ultrasonic technology, it disperses a fine mist into the air, and is ultra-quiet making it ideal to have on while you sleep. The humidifier is equipped with the option for warm or cool mist and 3 speed settings. A low water indicator light lets you know when it's time to refill the water tank. It also features a soft- glow night light, and a timer. PureGuardian® humidifiers create a better home environment for those suffering from colds, allergies and dry skin. *Note: Run time is based off of running the unit on low setting and cool mist, also depends on atmospheric conditions.Features:Large 7.57 L (2 gal.) tank provides up to 120 -hours* of run time and is great for medium to large roomsUltrasonic technology quietly disperses a fine mist providing relief from the dry airSilver Clean™ protection fights the growth of mould and mildew on the surface of the water tankChoose warm or cool mist to optimize your comfortElectronic control options include night light, 12-hour timer and 3 speed settingsLow water indicator illuminates when it’s time to refill the tankAuto shut-offHumidifier type: ultrasonic warm and cool mistMisting type: cool and warm mist with a dual mist rotating nozzle