Oura Smart Ring 4 Size 15 - Brushed Silver (JZ90-54220-15)

Oura Ring 4 – Smart Health Tracking, Refined

Introducing Oura Ring 4, the latest evolution of the groundbreaking smart ring designed to bring you closer to what matters most—your health. Built with an all‑titanium exterior and powered by Smart Sensing, Oura Ring 4 adapts to your unique finger and lifestyle, providing accurate insights across more than 30 biometrics. With up to 8 days of battery life, 24/7 comfort, and continuous monitoring, it works quietly in the background so you can focus on living well.

Key Features

Accurate, Adaptive Smart Sensing

Oura Ring 4’s new Smart Sensing platform adjusts to your finger and activity levels, delivering precise, continuous data day and night.

Designed for 24/7 Wear

Featuring an improved, seamless all‑titanium design, the ring is more comfortable and better‑fitting than ever. It’s water‑resistant up to 100m/328ft and suitable even for sensitive skin.

Long-Lasting Battery

Enjoy up to 8 days of battery life, with no screens or vibrations—just effortless, uninterrupted health tracking.

Health & Wellness Insights

Sleep

Wake up to detailed sleep analysis, including sleep staging, blood oxygen levels, HRV, and nighttime heart rate—helping you build better habits and feel your best.

Activity

Whether you’re training or simply staying active throughout the day, Oura tracks movement, steps, calories, and workouts, guiding you to balance exertion with recovery.

Readiness

Your daily Readiness Score combines over 30 body signals—including temperature, heart rate, HRV, and sleep quality—to show how prepared you are for the day.

Stress

Identify signs of stress and understand how well your body copes, so you can integrate self‑care practices and recover from long‑term stressors.

Illness Detection

Monitor changes in temperature and heart rate that may signal you're getting sick sooner.

Women’s Health

Track how your cycle influences mood, sleep, and activity. Predict your period up to 30 days in advance and follow body changes throughout your cycle.

Heart Health

Access daily heart rate and HRV insights, plus new metrics such as Cardiovascular Age and Cardio Capacity, helping you care for a key indicator of long‑term health.

Sensors & Technology

• Red & infrared LEDs: blood oxygen monitoring
• Green & infrared LEDs: continuous HR & HRV
• Digital temperature sensor
• 24/7 accelerometer activity tracking
• Bluetooth Low Energy
• Airplane mode supported
• Automatic firmware updates
• EMF‑safe

Materials & Durability

• Non‑allergenic titanium (inner & outer surfaces)
• Seamless titanium interior
• Water resistant up to 100m/328ft
• Minor scratches from regular wear are normal

Compatibility

• Works with iOS and Android
• Oura App available in: English, Finnish, Japanese, German, French, Spanish, Italian, Norwegian, Swedish, Czech, Dutch, Danish
• Supports metric and imperial units
• Integrates with 40+ apps

Product Specifications

• Colour: Brushed Silver
• Included: Oura Ring, Charging Dock & USB Cable
• Battery: 14.5mAh, up to 8 days
• Charging Time: ~80 minutes
• Sensors: Heart Rate, Temperature
• Width: 7.90mm
• Thickness: 2.88mm
• Weight: 3.3–5.2g (varies by size)
• Strap Vibration: No
• Location Services: No
• Cellular: Not Cellular