The NatureSpirit Cool Mist Ultrasonic Humidifier is a safe, quiet method of increasing the relative humidity in your home. Humidifiers are particularly useful when the outside air is cold and homes are heated. Cold air holds less moisture naturally and heating our homes further dries the air during winter. Dry indoor air can lead to respiratory problems and dry skin. The NatureSpirit Humidifier can be set to dispense mist in one direction or to automatically dispense in a 360 degree turn.