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

Price
$369.99
Taxes and shipping calculated at checkout
Condition: Good

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

Condition
Price
Excellent
$369.99
Sold out
Good
$369.99
Eco-Save
$369.99
Sold out
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12 Month Warranty

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Description

 

Oura Ring 4 Ceramic Smart Ring - Size 12 - Petal - Activity Tracker

OVERVIEW

The Oura Ring 4 Ceramic Smart Ring is an advanced, high-precision wearable health and activity tracker engineered to deliver continuous biometric telemetry in an elegant, screenless form factor. Crafted in a refined Petal finish, this sleek smart ring non-invasively monitors key physiological indicators including sleep stages, heart rate variability, body temperature trends, and daily activity levels. Powered by research-grade optical sensor algorithms and optimized power architecture, it offers health-conscious professionals and athletes deep performance insights with exceptional lifecycle longevity. This professionally refurbished Grade B unit provides full operational capabilities and incredible fiscal value for modern health and wellness management.

KEY FEATURES

  • Advanced Biometric Telemetry: Research-grade PPG optical sensors and body temperature tracking deliver precise, continuous health logging.
  • Sleek Ergonomic Architecture: The lightweight ceramic casing provides 24/7 all-day and night wearability without bulky screens or intrusive notifications.
  • Multi-Day Power Efficiency: Engineered with low-power micro-processing components that deliver multi-day continuous battery life on a single charge.
  • Seamless Mobile Synchronization: Utilizes high-efficiency Bluetooth Low Energy to effortlessly synchronize metrics with your companion smartphone application.

SPECIFICATIONS

Device Type Smart Ring / Activity Tracker
OS Version None (Syncs with companion iOS/Android App)
Processor / CPU Embedded Low-Power Microcontroller System
RAM Size + Type Embedded System Memory
Storage Onboard Sensor Data Storage
Screen / Display None (Screenless Telemetry Design)
Touch Screen No
Color Petal Ceramic
Battery Integrated Rechargeable Lithium-Polymer (Up to 8 Days Battery Life)
Hardware Upgradeability Rating Non-Upgradeable - Factory sealed water-resistant ceramic enclosure
Memory Upgradeability Non-Upgradeable - Integrated micro-processing architecture
Storage Upgradeability Non-Upgradeable - Fixed internal flash memory
Physical Ports & Expansion None (Utilizes magnetic inductive charging dock)

CONNECTIVITY

  • Bluetooth Connectivity: Integrated Bluetooth Low Energy (BLE) module for secure data transfer to mobile applications.
  • Sensor Array: Multi-wavelength optical PPG sensors, skin temperature sensors, and 3D accelerometer for activity recognition.

WHAT'S INCLUDED

  • Oura Ring 4 Ceramic Smart Ring (Size 12, Petal)
  • OR4 Sizing Kit
  • Magnetic USB Charging Dock & Cable

DOES NOT INCLUDE

  • Original Retail Packaging
  • USB Wall Charging Adapter

CONDITION

  • This is a refurbished product. It has been professionally inspected, thoroughly tested, and restored to full working condition. Light cosmetic wear or minor surface scuffs may be present on the outer band, but internal sensors and operational integrity is functional. Devices will have minor variations in cosmetic appearance.
See Specifications
Brand R3NEW
Title Oura Ring 4 Ceramic Smart Ring Size Before You Buy with OR4 Sizing Kit Size 12 Petal (2025)
Model JZ90-57459-12
Color Petal

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.