Aquamist Ultrasonic oil diffuser featuring soothing illumination day & Night. Aquamist features a constant soft light while diffusing nearly silent so it can be used both day and night. It creates negative ions with its ultrasonic action, and works to help purify the air! The ultrasonic action transforms water and essential oil into a cool mist. A personal size oil diffuser is with instant aromatherapy diffusion. This sleek smaller size diffuser is wonderful for dispersing your desired essential oil in smaller spaces. Aquamist is cool to the touch and adds a stylish look to any room. It diffuses essential oil for up to 5 hrs.