Very satisfied with this achat.La capacity of 500ml and silence are the assets I préfères.En effect I filled the late afternoon and quiet until noon the next day I sleep breathing air that leaves a light scent ( by species) in continu.En moment between colds and allergies that clog the nose ect ... since I used the appliance by putting 4/5 drops of eucalyptus globular, I'm not awake for it and wake IMPECC nose. no dry throat or headache :-) J'etais skeptical not knowing the aromatherapy but having health concerns and a little sick of treated drug I wanted tested and am not disappointed! I slowly discover the natural virtues with an easy to use device and entretien.De more light tones are restful, personal night I leave the blue it acts as nightlight but for those who prefer to sleep in the full black to put out this possibility in fonction.J'envisage bought one for the living room when I get like that and people are sick it cleaned ll'air ambient and a chance to not catch these viruses that are everywhere :-) plus it will look after my guests For those like me who do not know, before buying this kind of device the countenance look good because I bought into another more "design" but 180ml, obliged to fill 2 to 3 times a day and more a slight noise in the room that it was not top.Mon testimony is a bit long but I related my experience and tried to ask you best :-)