Oura Ring 4

Sleeker, smarter, and made for you

Our new Smart Sensing technology provides enhanced accuracy, deeper personalization, and longer battery life.
Sleek, fully-titanium design and discreet sensors provide 24/7 comfort.
Oura Ring 4 battery can last over a week — so you can go days without even thinking about charging.^*

Oura Membership grows with you

Oura Membership translates your body's data into actionable insights personalized to your unique needs. With innovative, AI-powered tools like Oura Advisor, get exclusive access to actionable insights that become increasingly tailored over time.

Heart Health

Sleep & Rest

Activity & Movement

Stress

Women’s Health

Metabolic

A person views the Oura app on their smartphone while wearing an Oura ring on their right index finger

Frequently Asked Questions

The sensors in the Oura Ring have been tested against laboratory results in multiple validation studies. See The Pulse Blog for more on Oura in research and scientific studies.

Wearables differ in where they're worn, the sensors they use, and how they process data. For the most consistent and meaningful insights, it's best to track trends and changes over time within your Oura Ring and Oura App, rather than comparing your Oura results to those from other devices.

The Oura Ring is water-resistant up to 100 meters (~330 feet), meaning that you can wear it while showering, swimming, or partaking in recreational diving (e.g. snorkeling), but we don’t recommend using your Oura Ring while scuba diving or keeping it submerged underwater for over 12 hours. Chlorine will not damage it.

Oura Ring operating temperature ranges from -10–52°C / 14–125°F. You can safely wear your Oura Ring in the shower, hot tubs, saunas, ice baths, and cryotherapy tanks. However, extended exposure to extreme temperatures (below -20°C / -4°F or above 60°C / 140°F) may lead to battery damage.

We recommend you use an Oura Ring sizing kit before selecting your Oura Ring size. The kit includes plastic ring sizers corresponding to Oura Ring sizes, which differ slightly from standard ring sizes (note: half sizes are not available).

For accuracy, wear the sizing ring for at least 24 hours, including while sleeping, before finalizing your size. If you’re between sizes, we recommend choosing the smaller size for a more secure fit. Visit our Sizing Page for more information.

What's included

Oura Ring 4
Size-specific charger
USB-C cable

Tech Specifications

Sensors

Red and infrared LEDs measure blood oxygen levels
Green and infrared LEDs alternate to measure heart rate and heart rate variability 24/7 and respiration rate
Digital sensor measures temperature trend variations
Accelerometer tracks movement and activity 24/7

Compatibility

Oura App is available in Czech, Danish, Dutch, English, Finnish, French, German, Italian, Japanese, Norwegian, Spanish, and Swedish
Supports metric and imperial units of measurement
Integrates with 40+ apps
Available on iOS and Android

Weight and Dimensions

Width: 7.90mm
Thickness: 2.88mm (similar to a wedding band)
Weight: 3.3 to 5.2 grams (depending on Oura Ring size)

Battery Life

Up to 8 days of battery^*
Typically charges in 20-80 minutes, depending on battery level

Quality Materials

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

Connectivity

Bluetooth Low Energy (Bluetooth Smart®)
Automatic firmware updates via Oura App
EMF-safe
Supports airplane mode
FCC-certified

^*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.