The Vicks Filter-Free Cool Mist Humidifier V4600 adds necessary moisture to the air to temporarily relieve dry air discomforts like cough and congestion to help you breathe easier. This item is easy to use and requires no filters so there's no excess equipment to go with it. The Vicks Cool Mist humidifier also has variable humidity control so you can adjust it to fit your needs. This piece of equipment holds up to two Vicks VapoPads for additional soothing comfort to help aid breathing. The capacity on this white humidifier is 4.5 liters or 1.2 gallons so it will hold enough to last for a while. It's recommended for use in medium-sized rooms so the optimal amount of vapor can fill the air. The run time of the Vicks Filter Free Cool Mist Humidifier V4600 is up to 33 hours, so you can maintain it for short periods of time. This product also comes with Vicks VapoPads to help you get started.