Only compatible with Oura Ring 5 (sold separately) Enjoy up to 30 days of battery life from a single charge With seamless charging, every heartbeat, movement, and moment of sleep is tracked, giving you a comprehensive view of your health Made of high-grade recycled aluminum, this match-box sized case fits easily into your pocket, carry-on, and gym bag Charging case is size-specific and can only be used with the matching Oura ring size (ring sold separately) USB-C cable is not included in the box Made by Oura. Unauthorized chargers may permanently damage the ring battery