The Oura Ring Gen 4 in polished Silver, Size 8 is a high-tech smart ring designed for unisex adults who prioritize their health and fitness. This activity tracker provides accurate measurements for heart rate, calories, and distance with its advanced sensors and measurement system. It is water-resistant. Featuring Bluetooth connectivity, temperature monitoring, and a variety of tracking features, this Oura ring is a stylish and functional accessory for those looking to improve their overall well-being. This ring is USED, it has faint scuffs everyday wear. In perfect working condition. Battery life is 2-3 days. Charger and cord included.