Crane Ultrasonic Cool Mist Humidifier - Owl Ultrasonic cool mist operation Increases air moisture for easier breathing and a good night's sleep Relieves cough, cold, and flu symptoms, including nasal congestion, dry cough, sinus irritation, nose bleeds, dry skin 1 gallon water tank runs whisper quiet up to 24 hours Mists up to 2.1 gallons of moisture per day Effectively humidifies rooms up to 250 square feet Auto shutoff safety sensor Uses less energy than a standard household light bulb Does not require a filter