This is a porous stone that the essential oils can be sprinkled on.
Operating instructions: sprinkle a few drops of essential oil or a mixture of essential oils on the aromatic scented stone. The porous stone with absorb the oil, which will evaporate gradually and fill the room with its scent. Specifically suited for smaller spaces: bedroom, hallway, toilet or in a closet. For larger spaces it's better to put the stone on the heater.