The product Tower enhances comfort helping you sleep better. It provides quick relief from the dry air making life pleasant for those with colds allergies and dry skin. The space-saving tower design with an easy-to-fill large 1.5-gallon tank is ideal for use in medium-size rooms. Unlike other humidifiers that grow slimy mold on the water tank surface Silver Clean Protection is embedded in the tank to fight the growth of mold and mildew on the surface of the water tank. Thanks to ultrasonic technology it disperses a fine mist into the air and is ultra-quiet making it ideal to have on while you sleep. This tower humidifier has an optional aroma tray so a few drops of essential oil can be added to create a relaxing atmosphere.