Ultrasonic humidifier uses a metal diaphragm vibrating at an ultrasonic frequency to create water droplets that are expelled out into the room to help maintain the desired humidity level. An ultrasonic humidifier is virtually silent when operating. Features include temperature control from warm or cold humidification, 1.4 gallon tank will run approximately 72 hours depending on atmospheric conditions. Low water indication lets you know when it’s time to refill the water tank. 14.5″ W. x 9″ L. x 12″ H. 2 year limited warranty. No. H2000: Capacity/Size: 1.4 gal, Width: 14.5″, Height: 12″, Depth: 9″