Excellent used conditions. Only a few months old. Slight sign of wear shown in close up photo. Ring, charger, box, and manual included. Retails for $400 ACCURACY WITH SMART SENSING - Oura Ring 4 is powered by Smart Sensing, which adapts to your unique finger and activity — delivering accurate, continuous data, day and night. HOLISTIC HEALTH TRACKING — Oura provides over 30 biometrics, including sleep, activity, stress, heart health, and women’s health metrics. DESIGNED FOR 24/7 WEAR—Oura Ring 4‘s updated design 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. LONG LASTING BATTERY - With up to 8 days* of battery life, no screens and no vibrations, Oura Ring 4 allows you to focus on the present.