The Oura Ring Gen 4 in Gold, size 5, is a brand new activity tracker that provides accurate heart rate monitoring, calorie tracking, and distance tracking for both indoor and outdoor activities. With a battery life of up to 7 days, this unisex device offers features such as temperature monitoring, sleep tracking, and advanced sensors including SpO2, accelerometer, and GPS. Made of metal and weighing 188.4 grams, this ring is designed for running and jogging activities, providing measurements in both decimal and imperial systems.