Easy To Use-Put the candle into the candle holder ，light the candle below Poured about 2/3 water into the bowl and then 4 - 6 drops of the oil into the bowl, then put the dish on the shelf. The tea light warms up the essential oils/ wax in stone saucer to diffuse aromas and fragrance. Tea lights usually burn out in 2.5 hours. Oil/water mixture may run out in 2 hours. You may need to add some oil & water when using.The base is separated from the bowl for easy cleaning.