The modern, simplistic design of the crane drop shape cool mist humidifier makes it a tasteful addition to any room in your home. a finalist in the 2011 international housewares design awards, the crane drop shape cool mist humidifier provides up to 24 hours of moisture on medium setting. suitable for rooms up to 250 square feet in size, this compact unit is energy-efficient and uses ultrasonic technology to add soothing moisture to dry air. crane's drop humidifier provides relief for cough and cold, nasal congestion, and dry itchy skin. available in an array of stylish colors, the drop humidifier is an ideal combination of form and function and makes a great gift for any occasion. this humidifier does not require a filter to operate.