Great product and good workmanship, best value for money, simple operation, just put 30-40ml of water (better bottle to avoid limescale) with the measuring cup in the saucepan with essential oils and after a minute the water already boils and gives off steam. You can adjust the amount of steam with a lever and with the knob the temperature in two positions (medium and very hot), the steam lasts about 15-20 minutes, it is warm and satisfying for suffumigi or face sauna. It has a protective system that turns off the device when all the water evaporates to prevent overheating. Absolutely recommended for those like me suffering from chronic rhinitis, but also useful for sinusitis or simple stuffy nose. With the addition of a few drops of essential oil of eucalyptus and mint in the water it becomes a real touchstone!