This Aroma diffuser is an electric device. An aroma oil diffusers are simple to use and can be placed throughout the house in places where you relax, bringing you a variety of health benefits at a very low cost. Although essential oils are dispersed in the air, they break down free radicals that contribute to the growth of harmful bacteria. Essential Oil Diffusion is the process of dispersing essential oils so that their aroma fills a room or an area with a natural fragrance. From simple to elaborate, many different methods exist for diffusing essential oils into a room.