ultrasonic humidifier,4 L tank. Automatic shut off when waterless. Perfect aroma difusing; Ultra silence design; ultrasonic humidifier,4L tank. Automatic shut off when waterless. Perfect aroma difusing; Ultra silence design;Certificate:CE,ROHSHumidifier Features:A.Ultrasonic humidification, applies together with medical atomizer unit.B. Make air fresh to relieve the physical discomforts of a dry ...