Opened to test size. Didn’t fit. Put back in the box. Missed return window. Basically new with open box. The Oura Ring Generation 3 Activity Tracker in Black Heritage, size 9, is a versatile device designed for both indoor and outdoor activities. Made from titanium, this unisex activity tracker provides heart rate and distance measurements, with a battery life of up to 7 days. It features a variety of sensors including infrared and SpO2, as well as functions such as a temperature sensor, heart rate monitor, water resistance, and sleep tracker. Ideal for users who enjoy a range of activities like gym training, swimming, and running, the Oura Ring provides a comprehensive monitoring experience for those looking to track their fitness progress.