What is a humidifier? this machine adds moisture to the air to prevent dryness that causes harmful effects in the body. With this portable car humidifier, you can stay in top shape even while you travel! Keep you body healthly and stress free on the go with our Ocean & Style™ Ultrasonic USB Car Humidifier. A simple plug-and-play humidifier that gives you maximum comfort even while driving. Also comes in a variety of colors to make it uniquely yours.