The Oura Ring Gen 4 in Silver, size 9, is a smart ring designed to track your fitness goals with precision. With a display resolution of 240 x 240, it provides detailed information on your heart rate, distance, and calories. This activity tracker is powered by batteries and has a battery life of up to 7 days. It features advanced sensors like an accelerometer and GPS, making it perfect for tracking indoor and outdoor activities, particularly running and jogging. The ring also includes features for monitoring your sleep and ensuring accurate tracking of your body's movements.