Oura Ring 4 is built around a breakthrough sensing technology, Smart Sensing, which adapts to your finger to deliver accurate, continuous data, day and night.
For the most up-to-date availability information on Oura Ring 4 or Oura Ring 4 Ceramic, check the Oura online store or an authorized retailer directly. Finish/color and size availability may vary by current inventory.
If you're setting up your Oura Ring 4 as a new or current member, see the instructions in Set Up an Oura Ring.
Hardware
Software
Oura Ring 4 vs. Oura Ring 4 Ceramic
More Information
Hardware
Oura Ring 4 features a fully titanium design and recessed sensors on the interior, enhancing both durability and wearability.
Oura Ring 4 Ceramic is made from high-performance zirconia ceramic, a premium material selected for its scratch resistance, luster, and color.
All Oura Ring 4 models are available in sizes 4-15.
The sizing for each Oura Ring model differs slightly between generations. Make sure to use the right sizing kit for the most accurate fit. The sizing kit boxes are labeled with the generation number that they are intended for.
- Oura Ring 5 Sizing Kit: white ring sizers, sizes 6–13
- Oura Ring 4 Sizing Kit: white ring sizers, sizes 4–15
For the best fit and most accurate readings, align your ring so that the sensors are against the palm side of your finger.
Sensors
- Smart Sensing is a sensing platform designed to give you the most complete picture of your health. The research-grade sensors work with an algorithm that adapts to the unique structure and skin tone of your finger and your current activity to deliver the most accurate, continuous data, day and night—all while optimizing battery life
- Red and infrared LEDs measure blood oxygen while you sleep
- Green and infrared PPG sensors alternate to measure heart rate 24/7 and heart rate variability and respiration rate during your sleep
- Digital temperature sensor measures average body temperature variations
- Accelerometer tracks movement and activity 24/7
External Surface Materials
- Oura Ring 4:
- Titanium with physical vapor deposition (PVD) or Diamond-like Carbon (DLC) coating, depending on finish
- Oura Ring 4 Ceramic:
- Zirconia ceramic
Inner Surface Materials
- Non-allergenic, titanium inner shell. This is a BPA-free inner surface
- Shock resistance and bonding between printed circuit board and ring outer frame
Connectivity
- Bluetooth Low Energy (Bluetooth Smart®)
- EMF-Safe and allows Airplane Mode
- FCC certified
Other Specifications
- Battery: Typically 5-8 days. Battery life and longevity depend on Oura Ring size, Oura App settings, feature configuration, activity, battery age, usage, and many other factors; actual results will vary. Battery life and charge cycles vary by use and settings. Battery tests were conducted across various sizes and scenarios. See Oura Ring 4 Battery Life and Ring Battery Tips for more information
- Charging time: Typically between 20-80 minutes depending on the ring starting charge level
- Water Resistance: 100m/328ft, suitable for sauna and water sports but not diving
- Operating Temperature: -10–54 ºC / 14–129 ºF. Charging at room temperature recommended
See more information in our Product Safety & Use article.
Software
Oura Ring 4 with active membership includes:
- Detailed sleep analysis
- 24/7 heart rate tracking (Daytime, Nighttime, Activity)
- Integration with third-party health and wellness apps like Strava
- Advanced temperature monitoring
- Blood Oxygen Sensing (SpO2)
- Daytime Stress
- Dynamic activity goals with Automatic Activity Detection
- Heart Health (Cardiovascular Age, Cardio Capacity (VO2 Max))
- Metabolic Health (Glucose Tracking, Meals)
- Oura Labs
- Resilience
- Weekly, monthly, quarterly, yearly, and anniversary reports
- Women's Health (Cycle Insights, Pregnancy Insights)
Body clock and chronotype, Explore content, and personalized activity goals were also available for Gen2 and Gen3 rings.
Regardless of the type of membership you have, your Oura Membership will continue to work seamlessly with Oura Ring 4. Since your membership is tied to your Oura account (not the ring itself), all of your data and benefits will carry over. Once you pair your new Oura Ring 4, you'll see all your data in the Oura App.
See Oura Membership for more information and pricing.
Oura Ring 4 vs. Oura Ring 4 Ceramic
| Oura Ring 4 | Oura Ring 4 Ceramic | |
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| Sensing Platform | Accuracy is powered by Smart Sensing that dynamically selects the optimal signal path | Accuracy is powered by Smart Sensing that dynamically selects the optimal signal path |
| Sensors |
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| Dimensions |
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