Disney Frozen 1 Gallon Ultrasonic Cool Mist Humidifier Cool Mist Humidifier can help relieve cold or flu symptoms and has a cute design children can enjoy. This humidifier is created to look like the beloved character Olaf from the hit Disney film Frozen. This ultrasonic humidifier adds moisture into the air, which can help to alleviate cough or nose congestion. This Emson product has a 1-gal capacity tank. It can run up to 24 hours straight per filling. There is no filter required. For added convenience and maintenance the humidifier has antimicrobial protection to fight against mold and mildew on the surface of the tank. Like new only used once 1-gal. capacity 24-hr runtime per filling No filter required Emson humidifier has a