Combat dry air in any living or working space with the Optimus Ultrasonic Cool Mist Humidifier U-31002. This device automatically shuts off once the water has been depleted as an added safety feature. This automatic humidifier also features an adjustable mist volume control to ensure that the room always remains comfortably moist. It features an extremely quiet operation with no bubbling or gurgling sounds so it will not disturb your sleep and you can enjoy undisturbed concentration when trying to work, read or perform other tasks. The Optimus humidifier also contains a removable transparent tank so that it is easy to refill. It boasts a handy refill light so that you will know exactly when it is time to add more water. It is the ideal way to alleviate symptoms of dry air and other issues such as dry skin, chapped lips and hands, asthma dry eyes and much more.