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Overview

The Oura Ring 4 in Silver, Size 10 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.
Open Box

Open Box - Oura Smart Ring with Health, Sleep & Fitness - Titanium - Silver - Size 10

Brand: Oura
Model: JZ90-54217-10
Web Code: 19813116
Sold and shipped by | 4.6 seller rating (65 reviews)

Sale ends: *

Available for deliveryAvailable online only

Delivery times vary by location. Most Marketplace items leave sellers' locations within 2 business days. Allow additional time for shipping.

Seller Return Policy

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Warranty

Check with the manufacturer for details.

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

This is an Open Box Product. It's been inspected and is fully functional. It includes all original accessories and a 1-year warranty (unless noted otherwise below). For return details, see the Return Policy tab. The product's specs are as follows:

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)
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.

Shipping Charges

Free standard shipping on all orders over $35 (before taxes, fees, and promo codes).

Processing Time

Most items ship within 2 business days after an order is placed*. Allow additional time for shipping to your address.
*Please note: If an item you ordered becomes unavailable, you'll be notified and a full refund will be processed within 2 business days.

Shipping Area Restrictions

Shipping is not available in the following areas*:
  • No restrictions in Canada
*Please note: Shipping area restrictions may vary for large items. If an item can't be shipped to your address, we'll let you know during the checkout process.
See our return policy to find specific return information for this product and steps on how to return by mail.