The doTERRA Roam Diffuser is made with natural, colorful ground stone, each polished to its ultimate uniqueness. With its powerful built-in rechargeable battery and charging dock, the doTERRA Roam Diffuser brings you an unprecedented wireless and portable aromatic experience the perfect host for your essential oils in any room. Water capacity: 100 mL Suggested room size: Up to 25sq. Continuous operation: Adapter powered up to 5 hours, battery powered up to 4 hours Intermittent operation (5 minutes ON/5 minutes OFF): Adapter powered up to 10 hours, battery powered up to 8 hours Cord-free and battery-powered, with a charging dock. Responsibly created with eco-friendly post-consumer recycled resin Ambient white, warm, and cyan light options. Automatic safety shut off.