Charge your Oura Ring 4 with this convenient charging dock, specifically designed for size 8 rings. It ensures a quick charge, taking between 20-80 minutes to reach full battery, depending on the current level. A status LED indicator conveniently shows when charging is complete. The charger includes a USB-C cable for easy power connection. This is the only way to charge your Oura Ring 4. Your Oura Ring 4 typically charges fully in 20-80 minutes, depending on its current battery level. It’s fast, convenient, and easy. It comes with a USB-C to USB-C Oura Ring Cable cord, intended to be supplied by an external 5Vdc supply that complies with IEC 62368-1 standard. Oura Ring 4 sizes are different from standard ring sizes, so it's recommended to use the Oura Ring 4 Sizing Kit before purchasing. First month of Oura membership is free with your purchase, with a monthly fee thereafter. Membership is tied to your account via the Oura App, not your physical ring. Oura tracks over 30 biometrics, including sleep, activity, stress, heart health, and women’s health metrics. Oura Ring 4 is powered by Smart Sensing, which adapts to you — delivering accurate, continuous data, day and night. With up to 8 days of battery life, no screens and no vibrations, Oura Ring 4 allows you to focus on the present. The updated design of the Oura Ring 4 is more comfortable, fits better than ever, and is water resistant. The first all-titanium smart ring combines exceptional durability with a gentle touch, even for sensitive skin. Compatible with iOS and Android — Oura seamlessly integrates with over 40 apps including Apple Health, Google Health Connect, Natural Cycles, Flo, Strava, & more.