VASO is the First Ceramic Vase Style with Separate Air/Water Divider Tanks Designed Aroma Diffuser with built-in Ultrasonic waves to produce the mist which disperses a soft fragrance. It comes with background natural sounds help more relax. It can be used as a mini vase. The smart sensor feature allows you simply pouring water to turn on with last preference setting and sleep when the water is out. Corresponding area: 6-8 stacks (about 12 square meters) Duration: approx. 4 hours in continuous mode.