Enjoy more moisture to the air you breathe with this ultrasonic cool mist humidifier. It will help you fight against dry weather which can cause irritation and unpleasant consequences for your body. With an easy-to-use knob for optimal control, this product sprays a cool, visible mist that instantly disperses into the room. Extremely quiet and does not even require the use of a filter. With a large tank that is ideal for easy cleaning and filling, it can hold enough water to run for up to 20 hours at a time. If the water runs out at any time, the ultrasonic cool mist humidifier will automatically shut itself off.