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Size before you buy.

Oura Ring sizes are different than standard ring sizes. Order a sizing kit or try on sample sizes in store to find your perfect fit.

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Overview

The Oura Ring 4 in Stealth, Size 5 is a discreet, all-titanium smart ring with Smart Sensing that adapts to your finger — tracking sleep, HRV, blood oxygen, temperature, and stress.
  • Up to 8 days of battery, no screens, no buzz. Auto-detects 30+ activities and gives a daily Readiness Score
  • Pairs with the Oura app on iOS or Android. First month of membership included; $7.99/mo after
This description was generated by AI and reviewed for accuracy.

Oura Ring 4 Smart Ring with Health, Sleep & Fitness - 8-Day Battery - Stealth - Size 5

Brand: Oura
Model: JZ90-54218-05
Web Code: 18390679
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For Quebec residents: See the Availability Guarantee disclosure in the Specifications section below.

What's included:

  • Oura Ring
  • Oura Ring Charger
  • Oura Ring Charging Cable
What You Need To Know
  • Sleep, recovery, and daily readiness in one all-titanium ring — designed to fit how you actually live
  • Tracks 30+ biometrics, including sleep stages, 24/7 heart rate, HRV, blood oxygen, skin temperature, and stress
  • Comfortable enough for 24/7 wear — no screens, no buzz, no notifications competing for attention
  • Up to 8 days of battery life on a single charge — among the longest in any smart ring
Better Sleep, Backed by Smart Sensing
  • Reads overnight signals — sleep stages, resting heart rate, HRV, and skin temperature — into a clear Sleep Score and Readiness Score each morning
  • Smart Sensing continuously adapts to your finger to keep readings accurate, even as your hands move
  • Patterns emerge over time, showing what helps (or hurts) your rest
24/7 Health Signals — 30+ Biometrics, One Picture
  • Tracks heart rate, HRV, blood oxygen, and temperature trends around the clock
  • Auto-detects 30+ activities, monitors stress, and predicts your cycle up to 30 days out
  • Every metric feeds into a single picture of wellness — without the noise of a smartwatch
  • Stress Resilience visualization shows how your body handles daily pressure
  • Cardiovascular Age and Cardio Capacity insights add a heart-health dimension
All-Titanium Build, Discreet Enough to Forget
  • Crafted in lightweight titanium with a smooth interior — sits flush on your finger in a slim, modern profile
  • Water-resistant for showering and handwashing
  • Quiet enough to wear overnight — most people forget it's even on
  • Compared with the Gen3, the Ring 4 has a smoother interior, a slimmer profile, and longer battery life
Works With the Oura App
  • Pairs via Bluetooth with the Oura app on iOS and Android
  • First month of Oura Membership included with purchase
  • Membership is $7.99/month after — unlocks personalized insights, advanced metrics, and ongoing coaching
  • Syncs with 40+ apps via Apple Health, Google Fit, Health Connect, Strava, and Natural Cycles
  • Oura Advisor is an AI-powered health coach that helps you understand your biometrics
  • Membership is $7.99/month or $89.99/year, with the first month included (new members only)
About This Variant: Stealth, Size 5The Stealth finish is a low-glare matte black — discreet, athletic-leaning, and easy to wear with anything. Size 5 sits in the smaller range — fingers can swell through the day, so we recommend the Oura Sizing Kit before buying to confirm your best fit.This description was generated by AI and reviewed for accuracy.

For Quebec residents – Disclosure under the Consumer Protection Act

In compliance with Bill 29, Best Buy and third-party sellers on Best Buy Marketplace do not guarantee the availability of replacement parts, repair services, or maintenance information for any products. Coverage provided through any Best Buy Protection programs and applicable manufacturer warranties, if any, remain in place. Please contact the manufacturer directly for information about their availability guarantee.