Enjoy the aroma of your favorite essential oil with the Bursera Diffusing Stone. This ceramic passive diffuser needs no batteries, charging, or water, making it a convenient choice for a car, desk, or living room. Its modern black design blends easily with a variety of interiors. Use essential oil as directed. For external use only - do not ingest oil or apply undiluted oil to the skin. The Bursera Diffusing Stone is a ceramic, black passive diffuser designed for use in a car, at a desk, or indoors. It requires no batteries, charging, or water. Use with essential oil as directed. For external use only - do not ingest oil or apply undiluted oil to the skin.