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Oura Ring 4 Ceramic Smart Ring Size Before You Buy with OR4 Sizing Kit Size 12 Tide (2025)

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

Oura Ring 4 Ceramic Smart Ring Size Before You Buy with OR4 Sizing Kit Size 12 Tide (2025)

Condition
Price
Excellent
$349.99
Sold out
Good
$319.99
Eco-Save
$299.99
$319.99
Sold out
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12 Month Warranty

on most devices

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on every device

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Description

 

Oura Ring 4 Ceramic Smart Ring Size 12 - Tide

OVERVIEW

The Oura Ring 4 Ceramic Smart Ring (Size 12, Tide) delivers comprehensive biometric telemetry and high-precision personal health tracking in an elegant, unobtrusive wearable format. Engineered with advanced Smart Sensing technology and multi-wavelength optical sensors, this device continuously monitors sleep architecture, heart rate variability, temperature shifts, and daily movement metrics without screen distractions. Featuring durable ceramic construction and dynamic algorithm adjustments, this hardware offers multi-day battery efficiency, seamless mobile synchronization, and exceptional long-term utility. Restored to Grade B refurbished condition, this smart ring provides corporate professionals and health-conscious users with elite wellness insights and outstanding fiscal value.

KEY FEATURES

  • Smart Sensing Biometric Architecture: Utilizes multi-wavelength optical sensors to accurately monitor sleep stages, continuous heart rate, and temperature variations around the clock.
  • Durable Ceramic Construction: Crafted from resilient, lightweight ceramic materials engineered for all-day comfortable wear and long-term structural integrity.
  • Ultra-Low Power Synchronization: Features low-energy Bluetooth wireless transmission, delivering up to 8 days of continuous health telemetry on a single charge.
  • Seamless Mobile Integration: Syncs effortlessly with the Oura App on iOS and Android to provide actionable daily recovery, readiness, and activity metrics.

SPECIFICATIONS

Device Type Smart Ring / Ceramic Wearable Architecture
OS Version None (Syncs via Oura App on iOS & Android)
Processor / CPU Integrated Oura Ultra-Low Power Sensor Controller
RAM Size + Type Embedded Micro-controller Memory
Storage Internal Flash Memory (Offline Data Logging)
Screen / Display None (Screenless Design)
Touch Screen No
Color Tide (Ceramic)
Battery Integrated Rechargeable Lithium-Polymer (Up to 8 Days Battery Life)
Hardware Upgradeability Rating Limited - Factory-sealed lightweight chassis designed for 100m water resistance
Memory Upgradeability Non-Upgradable - Permanently integrated within sensor architecture
Storage Upgradeability Non-Upgradable - Embedded onboard flash module
Physical Ports & Expansion None (Utilizes magnetic inductive charging dock interface)

CONNECTIVITY

  • Bluetooth Wireless: Bluetooth Low Energy (BLE) framework enabling efficient localized sensor data transfer to companion mobile devices.
  • Mobile App Synchronization: Direct continuous link with iOS and Android mobile platforms for cloud storage and health trend analysis.

WHAT'S INCLUDED

  • Oura Ring 4 Ceramic Smart Ring (Size 12, Tide)
  • OR4 Sizing Kit
  • Charging Dock with Cable

DOES NOT INCLUDE

  • Original Box
  • AC Wall Adapter

CONDITION

  • This item has been professionally tested by trained technicians and is fully functional. It is a refurbished product restored to full working order. Light signs of cosmetic wear or minor surface scuffs may be present. Devices will have minor variations in appearance.
See Specifications
Brand R3NEW
Title Oura Ring 4 Ceramic Smart Ring Size Before You Buy with OR4 Sizing Kit Size 12 Tide (2025)
Model Ring 4 Ceramic
Color Tide

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.