Click to open expanded view

Oura Ring 4 Ceramic Smart Ring Size Before You Buy with OR4 Sizing Kit Size 10 Cloud (2025)

Price
$269.99
Taxes and shipping calculated at checkout
Condition: Good

Oura Ring 4 Ceramic Smart Ring Size Before You Buy with OR4 Sizing Kit Size 10 Cloud (2025)

Condition
Price
Excellent
$279.99
Sold out
Good
$269.99
Eco-Save
$259.99
$269.99
Sold out
Compare product options
Only 1 left in stock!
American Express
Apple Pay
Diners Club
Discover
Google Pay
Mastercard
PayPal
Shop Pay
Visa

12 Month Warranty

on most devices

30-Day Money Back Guarantee

on every device

Fast Shipping

most orders ship same day

Description

 

Oura Ring 4 Ceramic Smart Ring - Size 10 - Cloud

OVERVIEW

The Oura Ring 4 Ceramic Smart Ring (Size 10, Cloud) is an advanced wearable telemetry device engineered to seamlessly monitor biometric signals, sleep metrics, and cardiovascular performance in a sleek, screenless form factor. Crafted with a premium ceramic finish and titanium interior, this smart ring delivers continuous health intelligence without screen distractions or intrusive notifications. Driven by precision optical sensing architecture, it delivers exceptional data accuracy to optimize daily recovery, stress tracking, and lifestyle performance. This Grade B refurbished device offers outstanding functional reliability and superior fiscal value for wellness-conscious individuals.

KEY FEATURES

  • Precision Smart Sensing Telemetry: Utilizes multi-wavelength optical sensors to continuously monitor heart rate, blood oxygen (SpO2), body temperature variations, and heart rate variability (HRV) with research-grade accuracy.
  • Comprehensive Sleep & Recovery Analytics: Measures sleep stages, readiness scores, and circadian rhythm alignment to deliver actionable daily insights for physical and mental recovery.
  • Resilient Ceramic & Titanium Architecture: Built with a lightweight ceramic exterior and water resistance up to 100 meters, ensuring durability for high-intensity workouts and daily wear.
  • Extended Multi-Day Battery Life: Features an ultra-low-power processor delivering up to 8 days of continuous continuous metric logging on a single charge via inductive magnetic wireless docking.

SPECIFICATIONS

Device Type Smart Ring / Advanced Wearable Telemetry Architecture
OS Version None (Companion Oura App for iOS & Android)
Processor / CPU Custom Ultra-Low-Power Microcontroller Unit (MCU)
RAM Size + Type Embedded Low-Power Sensor Buffer Memory
Storage Onboard Flash Memory (Stores up to 7 Days of Offline Telemetry Data)
Screen / Display None (Screenless Ceramic Design)
Touch Screen No
Color Cloud (Ceramic White Finish)
Battery Integrated Rechargeable Lithium-Polymer (Up to 8 Days Battery Lifecycle)
Hardware Upgradeability Rating Non-Upgradeability - Factory-sealed structural chassis rated for 100m water resistance.
Memory Upgradeability Non-Upgradeability - Memory permanently integrated within MCU layout.
Storage Upgradeability Non-Upgradeability - Onboard flash modules are fixed and embedded.
Physical Ports & Expansion None (Utilizes magnetic inductive wireless charging dock)

CONNECTIVITY

  • Bluetooth Low Energy (BLE): Wireless framework enabling continuous low-power telemetry links with companion iOS and Android smartphones.

WHAT'S INCLUDED

  • Oura Ring 4 Ceramic Smart Ring (Size 10, Cloud)
  • Magnetic Inductive Wireless Charging Dock
  • USB Charging Cable

DOES NOT INCLUDE

  • AC Wall Power Charging Adapter
  • Oura Membership Subscription (Sold separately)
  • Original Retail Packaging

CONDITION

  • This item has been professionally inspected, cleaned, and tested by trained technicians to be fully functional. Minor cosmetic imperfections such as light surface scuffs or slight outer band wear may be present. Devices will have minor variations in cosmetic appearance, but performance and hardware integrity are fully restored.
See Specifications
Brand R3NEW
Title Oura Ring 4 Ceramic Smart Ring Size Before You Buy with OR4 Sizing Kit Size 10 Cloud (2025)
Model JZ90-57460-10
Color Cloud

FAQ

What kind of warranty/guarantee do you offer?

At R3NEW, most transactions are backed by a 1-year warranty, covering technical defects and malfunctions, while every purchase includes a 30-day guarantee. Our warranty is designed to give you peace of mind, ensuring the reliability and longevity of your device.

What's the difference between the conditions? (Excellent, Good, EcoSave)

Great question! Let us break down the difference.

Excellent: Our Excellent condition devices offer a pristine user experience that rivals new units, boasting a flawless appearance with no visible scratches on the display or body. Each device undergoes rigorous testing to ensure it operates like new, giving you peace of mind with a full year of warranty coverage. It’s an ideal choice for those seeking near-new quality without the brand-new price tag

Good: Devices in Good condition are a great compromise between cost and quality. You might find a few minor scratches or slight nicks on the body or display, but these are purely cosmetic and don’t affect the device’s operation. We suggest using a case to bring its external appearance closer to 'like new.' Rest assured, every device meets our strict functional standards and comes with a one-year warranty for functionality

EcoSave: Opt for our EcoSave condition if you want to maximize value while minimizing environmental impact. These devices show visible signs of use, such as scratches or dents, which are purely cosmetic and can often be concealed with a case. Each device has passed our comprehensive functional tests and is backed by a one-year warranty, ensuring it works perfectly for you while also being kind to the planet.

Can I trust R3NEW?

We've sold electronics for over 15 years and are one of top trusted sources of certified refurbished electronics. Plus, with a 30-day guarantee and 12 month warranty, you can shop with peace of mind. If you have any issues at all, just email our support team and we'll help you out.