State of the art ultrasonic vaporization disperses essential oil and water particles without using heat, retaining full integrity and potency of your essential oil. Totally silent, and safe, this diffuser runs for up to 8 hours on continuous mode and up to 16 hours on intermittent mode. Switches off automatically when the water tank runs out. Soft white light or 7 color auto changing adds to its elegant appearance. USB cord powers it by your PC, laptop or power with a phone adapter. Calm and revitalize with this environment enhancing diffuser.