Continuous mists ( lasts approximately 4-5 hours ). 7 LED colors you can choose to rotate all colors or color of your choice. Auto shut off when water runs out. For better use, please read the instructions inside. Essential oils have been used for thousands of years for medical purposes, but only recently has there been a rise in popularity regarding what these organic compounds can do. Essential oils are natural oils that have been extracted from a variety of organics and botanicals. So, how do you use an essential oil diffuser for aromatherapy? Diffusion is the process of dispersing or spreading natural oil aroma within a space so that the fragrance of these oils permeates the air. A diffuser is basically a device that allows you to accomplish this. For better results use with our natural line of essential oils black label