*Cool Mist Humidifier: Uses the power of ultrasonic vibration to turn water into a cool hydrating mist that runs for up to 6 hours. Adding some humidity to the air, it can really help with dry lip/ dry nose/dry skin /dry mouth and throat/stuffy nose/ eye dryness that made a noticeable improvement in comfort when working or sleeping. Similarly, it can also be applied to the air conditioning humidifier in the car.