Cool mist smoothes. Dry air irritation. 5-hour steam time. USB-powered humidifier adds moisture to dry air for on-the-go relief which may ease symptoms of: cough; cold and flu; itchy, dry skin; congestion; chapped lips; dry eyes; headaches. Features: Portable cool mist; 3 settings: steam, steam/nightlight, nightlight; auto shutoff; 5-hour running time; 6-foot cord; plug into any USB port or adapter (adapter not included).