The hygienic and simple operation of the S200 steam humidifier will be a pleasure for the whole family. Hygienic because the water vapour is boiled before exiting and thus bacteria and minerals are efficiently eliminated. The built-in fan cools the steam so that the humidifier emits a pleasant hand warm steam. The device can be operated by turning the knob to one of two output levels (high or low). The cleaning is just as straight-forward: fill the base with water and the de-calcifying agent (EZCal or EZCal PRO recommended), activate the cleaning mode, rinse and wipe the base once complete and you're ready! Last but not least, the S200 has a fragrance tray for use with essential oils to add a pleasant aroma to your room.