The Bionaire BUH004 Ultrasonic Humidifier disperses a refreshingly cool mist into the air to eliminate dryness for maximum comfort and freshness. It can help to relieve the symptoms associated with a dry home environment: tiredness, dry eyes, scratchy throat, and can even help to relieve coughs, colds and congestion. It includes a hygrometer to help monitor humidity and temperature. Suitable for room size 30m. Ultrasonic humidification. 4 L water tank. Visible water level. Auto shut-off. Variable control. Quiet operation. Size H39, W17, D18cm. Manufacturers 2 year parts and labour guarantee.