Ultrasonic Cool Mist increases air moisture for easier breathing and a good nights sleep; Relieves cough cold and flu symptoms nasal congestion dry cough sinus irritation nose bleeds and dry skin and hair; Recommended non-medicated alternative to over the counter cough and cold medicine; Removable 1 gallon tank easily fits under most bathroom sinks; Runs whisper quiet up to 24 hours; FDA Registered BPA Free