Looking for a simple way to calm and freshen a room? The Ultrasonic Aroma Essential Oil Diffuser is elegant and easy to use. just add 100ML of water and a few drops of your favorite essential oil. Advanced ultrasonic vaporizing diffusion technology quietly releases a soothing fragrant mist up to 6 hours.Automatic shut off safety system when waterless protects the product from being burned out. Keep essential oil 100% natural without burning or heating and automatic shut off safely.