WHATS IN THE BOX - BRAND NEW: 1 Size 8 Silver Ring, 1 Charging Dock, 1 Type C to Type C USB Cable. The Ultrahuman Ring Air Smart Fitness Sleep Tracker in Space Silver is a sleek and sophisticated activity tracker designed for both indoor and outdoor use. With a battery life of up to 6 days, this ring provides accurate heart rate monitoring and features an optical bio-tracking sensor for tracking sleep patterns. It is suitable for both iOS and Android operating systems, making it accessible to a wide range of users. The titanium material and high-resolution display ensure durability and ease of use, while the 1-year manufacturer warranty provides peace of mind. Perfect for those interested in running and jogging, this activity tracker is a must-have for fitness enthusiasts.