This popular cold mist diffuser is low on energy, they use water and ultrasonic vibrations to disperse the molecules of the essential oil into the air via a fine mist. The Ultrasonic electric Diffuser is easy to use with an automatic OFF switch, these diffusers come with a 1 year guarantee. The Ultrasonic Aroma Diffuser is easy to use, simply add water and your chosen essential oils. Plug the Ultrasonic Diffuser into the socket and turn on. There is a function for mist, timer and light. The light is colour changing and is very soothing. Quantity - 1