About This

• 【SIZE BEFORE YOU BUY】For the best fit, please refer to the size chart and sizing guide shown in the product images to confirm your US ring size before ordering.
• 【Advanced Health Tracking】Track key wellness insights including sleep, heart rate, SpO₂, HRV, stress tracking, and blood pressure trends, with activity data such as steps, distance, and calories clearly displayed in the app to help you understand your daily health patterns over time.
• 【Women Health & Family Care Mode】Includes Women Health support to help track menstrual cycles when the app profile is set to female. Use Family Care Mode to view shared health insights from loved ones and stay connected with family anytime, anywhere.
• 【180+ Sports Modes & Activity Tracking】With 180+ sports modes, the smart ring supports a wide range of workouts and daily activities, such as running, cycling, walking, yoga, and more. View activity trends in the app to better understand your training habits.
• 【Long Battery Life & IP68 Waterproof】Designed for everyday wear, the smart ring offers reliable multi-day battery performance, reducing the need for frequent charging. Built with IP68 waterproof protection, suitable for workouts, rain, and light water exposure such as swimming activities.
• 【NO SUBSCRIPTION FEE】Enjoy full access to all features in the app with no subscription or monthly fees required — no hidden costs, no locked features.
• SYNC WITH YOUR FAVORITE APPS - Compatible with iOS and Android — Oura seamlessly integrates with over 40 apps including Apple Health, Google Health Connect, Natural Cycles, Flo, Strava, & more.
• LOOKING FOR THE BEST HEALTH TRACKER? - Whether you’re searching for a sleep ring or fitness ring, Oura Ring 4 is for you — this revolutionary smart ring that allows you to discreetly track your sleep, activity, recovery and stress — in style.

Overview

• Operating System : Wear OS 1.0
• Memory Storage Capacity : 16 MB
• Special Feature : Activity Tracker, Cycle Tracking, Daily Workout Memory, Lightweight
• Battery Capacity : 18 Milliamp Hours
• Connectivity Technology : Bluetooth
• Wireless Communication Standard : Bluetooth
• Battery Cell Composition : Lithium Polymer
• GPS : GPS Via Smartphone
• Shape : Round
• Screen Size : 1 Millimeters