The Oura Ring Gen 3 Horizon in Brushed Titanium, Size 7 is a sleek and durable sleep and fitness tracker suitable for both indoor and outdoor activities. It provides accurate measurements for heart rate, heart rate variability, calories, sleep quality, menstrual cycle, fitness activities and more. Its battery life lasts up to 7 days, and it is water-resistant, making it ideal for running and jogging in all weather conditions. The ring is compatible with both iOS and Android operating systems.
eBay