Oura Ring Gen 4 Silver Size 11 Brand New Sealed The Oura Ring Gen 4 in Silver, Size 11 is a brand new, sealed activity tracker designed for unisex adults. It features a 240 x 240 display resolution and is powered by batteries with a battery life of up to 7 days. The ring tracks heart rate, calories, and distance, providing measurements in both decimal and imperial units. Made of titanium and metal, it is suitable for indoor and outdoor activities and comes with a 1-year manufacturer warranty. With built-in sensors for SpO2, accelerometer, and GPS, this ring is perfect for tracking running and jogging activities. It is compatible with both iOS and Android operating systems.