The Oura Ring Gen 4 in Black, Size 10, is a brand new, factory sealed activity tracker designed for unisex adults. This 4th generation model includes advanced features such as temperature monitoring, heart rate monitoring, and sleep tracking. Perfect for running and jogging enthusiasts, the Oura Ring provides accurate measurements in both decimal and imperial systems. Made in Mexico, this innovative fitness technology is a must-have for anyone looking to track their performance and improve their overall health and wellness.