This Brand New Oura Ring Gen 4 Size 8 in Silver is a stylish and innovative activity tracker designed for both indoor and outdoor use. This unisex adults' device from the trusted brand Oura measures heart rate and provides up to 7 days of battery life. Perfect for running and jogging, this activity tracker is a must-have for anyone looking to improve their fitness and performance with advanced technology. Stay connected and on-track with this sleek and functional piece of fitness technology. The ring does not include the original box but it has never been used or worn.