OURA Ring 5 Smart Ring - Ring: Black: Next-level wellness tracking fits on your finger with the OURA® Ring 5, the world's smallest smart ring now featuring enhanced sensors, improved accuracy, and up to one full week of battery life in an even slimmer titanium design. From advanced sleep analysis and heart rate variability to stress monitoring and AI-powered health coaching, Ring 5 delivers the deepest insights yet without ever feeling like you are wearing a device. ; Enhanced sensor array delivers improved accuracy for sleep, HRV, and SpO2 readings. ; AI-powered health coaching adapts recommendations to your unique patterns and trends. ; Slimmer, lighter titanium design for 24/7 comfort you'll forget you're wearing. ; Up to 7 days of battery life with fast USB-C charging. ; 100% titanium. ; Imported. Measurements: ; Weight: 0.081 oz ; Product measurements were taken using size 9. Please note that measurements may vary by size.