Check the listing for details. Oura Ring Gen 3 Horizon Stealth Matte Black - Size 13. Color: Stealth (Black), Condition: Used. Listed at 80.00 USD. Oura Ring has some scratches. It’s got character! Could be brought down to the titanium ( see you tube). Comes with charger. Works perfectly. The Oura Ring Gen 3 Horizon Stealth Matte Black in size 13 is a high-tech activity tracker designed for unisex adults who prioritize fitness and wellness. With a sleek black design and advanced features such as heart rate monitoring, sleep tracking, and GPS tracking, this ring helps users track their daily activities and optimize their health and fitness goals. Powered by batteries and compatible with both iOS and Android devices, the Oura Ring offers up to 7 days of battery life and comes with a 1-year manufacturer warranty. Its versatile design allows for indoor and outdoor use, making it a must-have for those who love running and jogging.