Introducing Oura Ring 4: the latest evolution of the revolutionary smart ring. Oura Ring 4 brings you closer to what matters most — your health. The updated all-titanium design is powered by Smart Sensing, a new sensing platform that doesn’t just measure your biometrics, it adapts to you, providing insights into over 30 biometrics including sleep, readiness, activity, heart health, stress and women’s health. Oura Ring quietly and comfortably monitors your health and with up to 8 days of battery life — you can forget it’s even on. Sleeker, smarter and more accurate than ever, Oura Ring 4 is made for you. Key FeaturesSmall Yet PowerfulWith up to 8 days of battery life, no screens and no vibrations, Oura Ring 4 allows you to focus on the present. From a workout to a night out, the all-titanium design fits into your life comfortably and effortlessly — you’re free to forget it’s on. Until you start getting compliments. SleepA market leader in sleep tracking for over a decade, Oura gives you best-in-class insights into your sleep quality. Feel more rested every day with personalized recommendations based on your sleep patterns. Features include: Sleep Staging, Nap Detection, and Blood Oxygen Sensing (SpO2). ActivityStay motivated with personalized daily activity goals. Oura tracks your heart rate, activity levels, and training frequency to tell if you're hitting your goals and to make sure you’re giving your body enough recovery time. Features include: Automatic Activity Detection, Workout Heart Rate, and Activity Goals. StressOura will help you identify signs of stress and understand how well your body handles it. You'll know when you need to incorporate more self-care practices and how to recover from longer-term stressors. Features include: Daytime Stress and Stress Resilience. Women's HealthOura helps women listen to their bodies like never before. By using temperature trends, Oura can more accurately predict the phases of your menstrual cycle and tailor recommendations based on your unique health patterns and hormone levels. Features include: Cycle Insights, Period Prediction, and Seamless Integrations. Heart HealthFrom monitoring your daily heart rate and HRV to discovering your Cardiovascular Age and Cardio Capacity, Oura helps you take care of one of the key indicators of your overall health — your heart. Device CompatibilityCompatible with iOS and Android —Oura seamlessly integrates with over 40 apps including Apple Health, Google Health Connect,  Natural Cycles, Flo, Strava, & more.