An optimum humidity level is 40%- 60%, this value is often not reached, particularly in winter, when cold air enters living spaces that are being artificially heated. This dry ambient air draws in moisture via any source which can result in dry skin and irritated eyes. Dry air is also bad news for allergy sufferers as dust particles spread more easily. The LB88 maintains the air to ensure the ideal humidity. HIH humidification output with ultrasound humidification technology. Easy clean filter. Suitable for room size 48m. Ultrasonic humidification. 6 L water tank. Visible water level. Auto shut-off. 3 speed settings. Variable control. Quiet operation. Washable filter. Size H28, W19.5, D29.5cm. Low energy consumption. Manufacturers 3 year guarantee.