Teardrop blue 38 white cool mist humidifier ultrasonic cool mist increases air moisture for easier breathing relieves cough cold and flu symptoms also nasal congestion dry cough sinus irritation nose bleeds and dry skin47hair clean control antimicrobial material in the base helps reduce mold and bacteria growth by 999637 it has a removable 1 gallon tank it whisper quietly and has auto off function does not require filter