The NEW Oura ring gen 4 in size 9 is a sleek and advanced activity tracker designed to track your fitness and running performance. With features like Bluetooth connectivity, heart rate monitoring, and sleep tracking, this ring is perfect for runners and fitness enthusiasts. It also includes sensors such as Infrared, SpO2, accelerometer, gyroscope, and optical bio-tracking to provide accurate data on your movements and vital signs. The black color adds a stylish touch to this high-tech fitness technology.