W7 Ultrasonic HumidifierW7, the cool mist humidifier, stands at two feet tall and offers long standing technology a fresh, new look. This floor model transforms any space with a steady mist and optional aroma feature. The water tank is easily removable and when emptied will shut automatically. Humidifies 650 square feet. Runs for approximately 22 hours. Material: Wood and plastic interior Dimensions: 6" x 6" x 30"