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OURA

Oura Ring 4 - Black - Size 10 - Smart Ring, Sleep, Activity, Women’s Health, AI Advisor, Up to 8 Days of Battery Life, Size Before You Buy, Android & iOS Compatible (Renewed)

Based on 7 reviews
Condition: Refurbished - Excellent
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$219.95
Save $129.05 was $349.00

Buy Now, Pay Later

As low as $36.66 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 90-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: Only 1 left in stock, order soon!
Fulfilled by A4C Online
Arrives Monday, Nov 2
Order within 7 hours and 28 minutes

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At a glance

Condition
Refurbished - Excellent
Style
Metallic
Color
Black
Size
10
Model
JZ90-54144-10
Dimensions
1.06 x 1.06 x 0.28 in
Weight
0.11 kg
Warranty
90 days limited warranty
Works with
Smartphone

Features 5

  • ACCURACY - SMART SENSING - Oura tracks over 50 health metrics, including sleep, activity, stress, heart health, and womens health metrics. Oura Ring 4 is powered by Smart Sensing, which adapts to you delivering accurate, continuous data, day and night
  • LONG LASTING BATTERY - With up to 8 days of battery life, no screens and no vibrations, Oura Ring 4 allows you to focus on the present. From a workout to a night out youre free to forget its on. Until you start getting compliments
  • OURA MEMBERSHIP - First month of membership is included with purchase, for new members only. Subscription is 5.99/mo afterwards. Membership is tied to your account via the Oura App, not your physical ring
  • HSA/FSA ELIGIBLE - We can accept HSA or FSA funds for the following: Oura Ring, additional chargers, and shipping

Description

Oura Ring 4 brings you closer to what matters most — your health. With an updated all-titanium design, this smart ring features Smart Sensing, a new sensing platform that doesn’t just measure your biometrics but also adapts to you. It provides insights into over 50 biometrics including sleep, readiness, activity, heart health, stress, metabolic health and women’s health.

Specs 35

Operating System I os, android
Special Feature Activity Tracker, Cycle Tracking, Daily Workout Memory, Lightweight
Connectivity Technology Bluetooth
Wireless Communication Standard Bluetooth
Battery Cell Composition Lithium Polymer
GPS GPS Via Smartphone
Shape Round
Brand OURA

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Nov 2

Yes, absolutely! You may return this product for a full refund within 90 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

Expensive ring with an Annual fee
Style: Metallic Color: Gold Size: 10
It does not state that you have to pay a monthly or annual fee when you purchased this watch that’s not in the information
Reviewed in the United States on July 23, 2026 by Rosie
This vendor is dependable.
Style: Metallic Color: M - Silver Size: 11
Though used I could not tell it, the charger seemed to be not the same as the previous ring that was too small. But I get 8 days at least including the blood oxygen feature which reduces battery life a little. Everything else was perfect.
Reviewed in the United States on September 14, 2026 by C. Bryan
Renewed Oura is not for a first time owner.
Style: Metallic Color: Black Size: 10
This is my second Oura ring, so buying a renewed version worked out ok for me. My ap simply dropped my 4 year-old ring that lost its charging capabilities, and synced this one in a minute. But if you’ve never had an Oura ring before, I would be upset to receive in a box literally just…a ring, a charging station, and a cord sealed in a plastic bag. That being said, it works perfectly fine and is undamaged. But it came with none of the original packaging or information to help someone sign up for Oura. Renewed rings I wouldn’t recommend for a first time owner who is unwilling to navigate correct sizing and all the start up subscription steps without correct prompting. ... show more
Reviewed in the United States on September 15, 2026 by suzman
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