The outer shell of the doTERRA Roam Diffuser is made with natural, polished ground stone, making each diffuser unique. The rest of the diffuser is made from an eco-friendly post-consumer recycled resin, which adds to its simple, natural beauty. With its powerful built-in rechargeable battery and accompanying charging dock, the doTERRA Roam Diffuser brings you an unprecedented wireless and portable diffusing experience – perfect for any room in your home or office!