The Oura Ring 4 Smart Ring in Size 10 and Silver color is a sleek and powerful activity tracker with advanced features. It provides measurements for heart rate, calories, and distance, and even includes a sleep tracker for added insight into your daily routine. The ring is designed for both indoor and outdoor use, and has a battery life of up to 7 days. Made with titanium, it is durable and lightweight, weighing 6.7 oz. The ring is compatible with both iOS and Android operating systems. The listing comes with: