The Oura Ring (Gen 3) Size 11 Horizon is a sleek and advanced activity tracker made of titanium, designed for both indoor and outdoor use. It features a display resolution of 240 x 240 and provides heart rate monitoring with up to 7 days of battery life. This unisex device is compatible with both iOS and Android operating systems, and offers features such as temperature monitoring, sleep tracking, and an accelerometer sensor for accurate movement tracking. Perfect for runners and joggers, the Oura Ring is a must-have for fitness enthusiasts wanting to track their performance and improve their overall health.