Ultrasonic oil diffusers are the most popular and widely available type of diffusers, only needing a small amount of distilled water and a few drops of an essential oil to operate oil diffuser home fragrance Diffusers, Aroma Diffusers, Aroma Oil diffusers, Aroma oil diffuser electric . It puts out a strong stream of mist, has a larger capacity and smaller footprint than much of the competition