The Oura Ring Gen 4 in black is a brand new, factory-sealed activity tracker designed for unisex adults. It features a display resolution of 240 x 240 and a 2.4x external display for easy viewing. The ring is equipped with sensors for measuring heart rate, calories, and distance, making it suitable for indoor and outdoor activities such as running and jogging. With a battery life of up to 7 days and a 1-year manufacturer warranty, this Oura Ring is a reliable tool for tracking your fitness goals in both decimal and imperial systems. Available in a size 10, this metal ring also offers features such as a sleep tracker and heart rate monitor.