Make dry air a problem of the past with the 100-hour ultrasonic cool and warm mist humidifier. It is ideal for use in medium and large-sized rooms. Silver clean(TM) protection is embedded in the tank to fight the growth of mould and mildew. The ultrasonic technology disperses a cool mist into the air quietly and will not disturb while you sleep. Treat yourself to aromatherapy at home with a few drops of essential oil to create a relaxing atmosphere. The humidifier is equipped with a night light and 3-speed mist control. A low water indicator light lets you know when it's time to refill the water tank. The humidifier creates a better home environment for those suffering from colds, allergies and dry skin.