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Oura Ring 4 Ceramic Smart Ring - Size 15 - Midnight (2025)

Price
$319.99
Taxes and shipping calculated at checkout
Condition: Good

Oura Ring 4 Ceramic Smart Ring - Size 15 - Midnight (2025)

Condition
Price
Excellent
$339.99
Sold out
Good
$319.99
Eco-Save
$299.99
$319.99
Sold out
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12 Month Warranty

on most devices

30-Day Money Back Guarantee

on every device

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Description

 

Oura Ring 4 Ceramic Smart Ring - Size 15 - Midnight

OVERVIEW

The Oura Ring 4 Ceramic Smart Ring (Size 15, Midnight) is a sleek wearable health solution engineered to integrate comprehensive biometric telemetry into a discrete ring format. Encased in a durable Midnight ceramic housing, this device is optimized for enterprise professionals, athletes, and wellness-focused individuals seeking continuous physiological tracking. Driven by an ultra-low-power embedded processing platform, it delivers outstanding multi-sensor efficiency and seamless data synchronization with companion smartphones. Offering reliable long-term performance, this refurbished hardware configuration delivers elite lifecycle longevity and exceptional fiscal value for modern digital health tracking.

KEY FEATURES

  • Advanced Biomedical Telemetry: Multi-wavelength optical sensors continuously track heart rate, blood oxygen, and body temperature fluctuations with precision.
  • Durable Ceramic Construction: Lightweight yet scratch-resistant Midnight ceramic exterior designed for 24/7 wear and long-term structural integrity.
  • Comprehensive Sleep & Wellness Scoring: Synthesizes physiological data into actionable daily readiness, sleep, and activity metrics to maximize performance.
  • Extended Battery Lifecycle: Low-power embedded architecture provides multi-day continuous usage on a single charge for seamless daily operation.

SPECIFICATIONS

Device Type Smart Ring / Wearable Health Architecture
OS Version None (Proprietary Embedded Firmware, iOS/Android App Compatible)
Processor / CPU Integrated Ultra-Low-Power Microcontroller / System-on-Chip (SoC)
RAM Size + Type Embedded Low-Power SRAM
Storage Integrated Fixed Flash Memory (Onboard Telemetry Logging)
Screen / Display None (Screenless Minimalist Architecture)
Touch Screen No
Color Midnight Ceramic
Battery Integrated Rechargeable Lithium-Polymer Cell (Up to 8 Days Battery Life)
Hardware Upgradeability Rating Limited - Factory-sealed seamless enclosure rated for 100m water resistance; hardware non-serviceable.
Memory Upgradeability Non-Upgradeable - Memory modules permanently integrated within custom SoC.
Storage Upgradeability Non-Upgradeable - Onboard flash storage is fixed and embedded.
Physical Ports & Expansion None (Utilizes magnetic wireless inductive charging dock interface)

CONNECTIVITY

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

WHAT'S INCLUDED

  • Oura Ring 4 Ceramic Smart Ring (Size 15 - Midnight)
  • Charging Dock with USB Power Cable

DOES NOT INCLUDE

  • Original Box
  • Sizing Kit
  • USB Wall Power Adapter

CONDITION

  • This item has been professionally tested by trained technicians and is fully functional. It has been professionally restored to very good working order with minor cosmetic imperfections, light surface scuffs, or subtle signs of wear on the finish. Devices will have slight variations in appearance. This is a refurbished product that offers reliable functionality and excellent value.
See Specifications
Brand R3NEW
Title Oura Ring 4 Ceramic Smart Ring - Size 15 - Midnight (2025)
Model Oura Ring 4 Ceramic
Color Midnight

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.