Diffuser Nebulizer -Glass -White Wood Base Oval No Water Needed There is no stronger or more effective aroma diffuser on the market. Get the purest, most concentrated scent over a large area in a very short time. Natural and Quiet: Glass and wood and only uses pure essential oil. No water to dilute the fragrance or grow the mold. No heat to change the therapeutic properties of your oils. No plastic to dissolve toxic chemicals. In addition, nebulizer essential oil diffusers are silent. With your ear placed right next to the unit, you will hear a soft, faint buzzing sound - Low Sound. FC, CE and RoHS Certified - Safe and Secure. How it works ?