Product: Size 12 Black Charging Case Compatible only with Oura Ring Gen 3 Horizon and Heritage models. Not compatible with Gen 4 or other smart rings. Key benefits Size specific fit: Designed for ring size 12. Confirm your ring size printed inside your Oura Ring Gen 3 before . A mismatch in size can prevent charging. Portable backup power: Built in 600 mAh battery supplies up to four full charges for your Oura Ring Gen 3 Horizon or Heritage, so you can recharge on the go without a wall outlet. Safe charging: LED charge indicator, energy saving design, over current protection, short circuit protection, and over voltage protection. The charger automatically shuts off when the ring is fully charged for reliable, hands operation. Compact protection: The slim black charging case stores and protects the ring from dust and scratches while charging or during transport. Features Compatibility: Works only with Oura Ring Gen 3 Horizon and Heritage. Not for Gen 4 or other smart rings. Battery capacity: 600 mAh built in battery for multiple full charges. Indicators and protections: LED indicator plus over current, short circuit, and over voltage protections; automatic shutoff at full charge. Portability: Small footprint and protective case design make it easy to carry in a bag or pocket. How it solves common problems Keeps your ring powered when you are away from home and cannot access a charger. Prevents accidental overcharging with automatic shutoff and built in safety protections. Avoids charging failure from an incorrect cradle fit by matching the case to the ring size. Practical use scenarios Travel: Charge your ring during flights or overnight stays without needing a power outlet. Commute and work: Recharge between meetings or during long workdays to maintain ring availability. Outdoor activities: Bring the charging case on hikes or day trips to up battery when you are away from home. Notes and precautions Check the ring size printed inside your Oura Ring Gen 3 before ordering. Size mismatch will prevent the ring from making proper contact and charging. This product is intended only for the specified compatibility and functions described above.