The Oura Ring Gen 4 in Brushed Silver, Size 12 is a versatile fitness tracker suitable for both indoor and outdoor activities. With a battery life of up to 7 days, this activity tracker provides accurate measurements in both decimal and imperial systems. It features a sleep tracker, heart rate monitor, and Bluetooth connectivity for seamless data collection. Made by the brand Oura, this smart ring is designed for unisex adults who engage in activities like running and jogging. The sleek silver design and compact size make it a stylish and practical accessory for tracking one's fitness progress.