Oura Smart Ring 4 Size 8 - Gold (JZ90-54216-08)

Oura Ring 4 – Smart Health, Evolved

Introducing the Oura Ring 4, the latest evolution of the revolutionary smart ring designed to bring you closer to what matters most—your health. Crafted with an updated all‑titanium design and powered by Smart Sensing, Oura Ring 4 adapts to your unique finger and lifestyle to deliver accurate, continuous insights into over 30 key biometrics, including sleep, readiness, activity, heart health, stress and women’s health. With up to 8 days of battery life, you can wear it comfortably around the clock and almost forget it’s on.

Key Features

Smart, Adaptive Accuracy

Powered by Smart Sensing, Oura Ring 4 adjusts to your unique finger and daily activity for precise, continuous day‑and‑night measurements.

Designed for All‑Day, Everyday Wear

The updated, more comfortable fit features the first all‑titanium smart ring with a seamless interior. Durable, water‑resistant, and gentle even on sensitive skin.

Long‑Lasting Battery

Enjoy up to 8 days of battery life with no screens or vibrations—allowing you to stay present while Oura works quietly in the background.

Health & Wellness Insights

Sleep

Wake up to comprehensive sleep analysis, including sleep stages, blood oxygen levels, HRV, and nighttime heart rate—helping you improve habits and transform how you feel.

Activity

From workouts to daily movement, Oura tracks steps, calories burned, and activity levels to help you balance movement and recovery.

Readiness

The Readiness Score evaluates over 30 body signals—such as temperature, sleep, heart rate, and HRV—to show how prepared you are for the day.

Stress

Identify signs of stress and understand how well your body manages it, helping you prioritize recovery and self‑care.

Illness Detection

Temperature and heart rate monitoring help alert you when your body may be showing early signs of sickness.

Women’s Health

Track your cycle, understand its daily impact on your body, and receive period predictions up to 30 days in advance.

Heart Health

Monitor daily heart rate and HRV and gain insights into long‑term heart wellness, including cardiovascular indicators.

Product Specifications

• Accessories Included: Oura Ring, Charging Dock & USB Cable
• Battery: 14.5 mAh, up to 8 days of use
• Charging Time: 80 minutes
• Power Supply: Rechargeable battery
• Sensors & Trackers: Heart rate, temperature
• Strap Colour: Gold
• Vibration Alert: No
• Water Resistance: Up to 100m / 328ft
• Materials: Non‑allergenic titanium (inner & outer), seamless titanium interior
• Dimensions:
  • Width: 7.90 mm
  • Thickness: 2.88 mm
  • Weight: 3.3–5.2 g (varies by size)

Sensor Technology

• Red & infrared LEDs: blood oxygen levels
• Green & infrared LEDs: continuous HR & HRV, respiration rate
• Digital temperature sensor: trends and variations
• 24/7 accelerometer: activity and movement

Compatibility & Connectivity

• Oura App available in: English, Finnish, Japanese, German, French, Spanish, Italian, Norwegian, Swedish, Czech, Dutch, Danish
• Integrates with 40+ apps
• Supports metric & imperial units
• Works on iOS and Android
• Bluetooth Low Energy
• Automatic firmware updates
• Airplane mode & EMF‑safe
• FCC‑certified

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