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Oura - Ring 4 - Smart Ring - Size 12 - Stealth

Price
$279.99
Taxes and shipping calculated at checkout
Condition: Eco-Save

Oura - Ring 4 - Smart Ring - Size 12 - Stealth

Condition
Price
Excellent
$319.99
Sold out
Good
$299.99
Sold out
Eco-Save
$279.99
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12 Month Warranty

on most devices

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Description

 

Oura - Ring 4 - Smart Ring - Size 12 - Stealth

OVERVIEW

The Oura Ring 4 (Size 12, Stealth) is an advanced, screenless smart wearable engineered to deliver research-grade 24/7 biometric tracking and physiological monitoring in an ultra-discreet form factor. Crafted with a lightweight, fully titanium interior and exterior, this ring continuously tracks sleep quality, readiness levels, heart rate variability, and daily physical activity metrics. Powered by Smart Sensing technology, the hardware dynamically adapts to your finger orientation to deliver optimal signal stability throughout high-intensity daily routines and rest cycles. Fully compatible with iOS and Android companion ecosystems, this refurbished Grade C hardware configuration offers exceptional multi-day battery lifecycle performance and outstanding fiscal value for modern health-conscious users.

KEY FEATURES

  • Smart Sensing Technology: Utilizes dynamic multi-wavelength optical sensors that automatically adapt to finger placement to maintain continuous, high-fidelity biometric accuracy.
  • Comprehensive Health Telemetry: Delivers round-the-clock actionable insights on sleep architecture, daytime stress, heart rate variability, and active recovery metrics.
  • Durable Titanium Design: Features a recessed, ultra-comfortable all-titanium build finished in matte Stealth, backed by an 80-meter water resistance rating.
  • Extended Multi-Day Battery: High-efficiency power optimization delivers up to 8 days of uninterrupted continuous tracking on a single charge cycle.

SPECIFICATIONS

Device Type Smart Ring / Health & Fitness Wearable
OS Version Proprietary Embedded Firmware (iOS / Android Compatible)
Processor / CPU Embedded Low-Power Microcontroller / Smart Sensing Chipset
RAM Size + Type Embedded System Memory
Storage Onboard Flash Memory (Stores up to 7 days of detailed biometric data)
Screen / Display None (Screenless Ergonomic Design)
Touch Screen No
Color Stealth (Matte Black Titanium)
Battery Integrated Rechargeable Lithium-Polymer (Up to 8 Days Battery Life)
Hardware Upgradeability Rating Non-Upgradeability - Factory-sealed titanium body rated for 80m water resistance.
Memory Upgradeability Non-Upgradeability - Memory is permanently integrated into the core architecture.
Storage Upgradeability Non-Upgradeability - Fixed internal memory architecture.
Physical Ports & Expansion None (Utilizes magnetic inductive wireless charging dock)

CONNECTIVITY

  • Bluetooth Low Energy (BLE): Ultra-low power wireless communication layer for reliable background syncing with the Oura App.
  • Integrated Multi-Sensor Array: Includes red, green, and infrared PPG sensors, skin temperature sensors, and a 3D accelerometer.

WHAT'S INCLUDED

  • Oura Ring 4 Device (Size 12, Stealth)
  • USB-C Charging Dock

DOES NOT INCLUDE

  • Original Box
  • AC Wall Adapter

CONDITION

  • This product is fully functional and has been thoroughly tested and restored by qualified technicians. It exhibits noticeable cosmetic wear, including moderate scratches, scuffs, or surface rubbing on the Stealth finish from regular use. These visual blemishes are purely cosmetic and do not impact sensor accuracy, battery integrity, or core system operations.
See Specifications
Brand R3NEW
Title Oura - Ring 4 - Smart Ring - Size 12 - Stealth
Model Oura Ring 4
Color Stealth

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.