Crane Ultrasonic Cool Mist Humidifier Monkey. Ultrasonic cool mist operation. Increases air moisture for easier breathing and a good night's sleep. Relieves cough, cold, and flue symptoms, including nasal congestion, dry cough, sinus irritation, nose bleeds, dry skin. Removable 1 gallon water tank runs whisper quiet 11-24 hours. Mists up to 2.1 gallons of moisture per day. Effectively humidifies rooms up to s250 square fee. Auto shutoff safety sensor. Uses less energy than a standard household light bulb. Power On indicator