The Oura Ring Gen3 Heritage Stealth US10 is a brand new, sealed activity tracker designed for fitness enthusiasts, specifically for running and jogging. With a sleek stealth color and compact dimensions of 4.25 x 4.25 x 1.75 inches, this ring is lightweight at 0.500 lbs. The Oura Ring is a reliable tool for tracking your fitness progress, providing valuable insights to help you achieve your health goals. Its innovative design and advanced technology make it a must-have for those looking to enhance their athletic performance.