---
product_id: 811946275
title: "Oura Ring 4 - Ceramic Midnight - Size 8 - Smartring | Non-Standard Fit – Measure with Compatible Size Kit | Sleep, Heart Rate and Fitness Tracking Wearable | 8-Day Battery, iOS/Android Supported"
brand: "oura"
price: "$U38047"
currency: UYU
in_stock: true
category: "Oura"
url: https://www.desertcart.uy/products/811946275-oura-ring-4-ceramic-midnight-size-8-smartring-non-standard
store_origin: UY
region: Uruguay
---

# 8-day battery life Water resistant up to 100m Tracks 50+ health metrics Oura Ring 4 - Ceramic Midnight - Size 8 - Smartring | Non-Standard Fit – Measure with Compatible Size Kit | Sleep, Heart Rate and Fitness Tracking Wearable | 8-Day Battery, iOS/Android Supported

**Brand:** oura
**Price:** $U38047
**Availability:** ✅ In Stock

## Summary

> 💍 Elevate your wellness game with the ring that knows you best.

## Quick Answers

- **What is this?** Oura Ring 4 - Ceramic Midnight - Size 8 - Smartring | Non-Standard Fit – Measure with Compatible Size Kit | Sleep, Heart Rate and Fitness Tracking Wearable | 8-Day Battery, iOS/Android Supported by oura
- **How much does it cost?** $U38047 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.uy](https://www.desertcart.uy/products/811946275-oura-ring-4-ceramic-midnight-size-8-smartring-non-standard)

## Best For

- oura enthusiasts

## Why This Product

- Trusted oura brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Unplug & Go:** Up to 8 days of battery life means freedom from constant charging.
- • **Sleek Ceramic Design:** High-performance zirconia ceramic for durability and minimalist elegance.
- • **All-Day Smart Sensing:** Continuous, adaptive tracking of sleep, heart rate, stress, and more.
- • **Seamless App Integration:** Sync effortlessly with iOS and Android for real-time health insights.
- • **Precision Sizing Kit Included:** Get the perfect fit before you buy—no guesswork, just comfort.

## Overview

The Oura Ring 4 Ceramic Midnight is a cutting-edge smart ring designed for 24/7 wear, crafted from durable zirconia ceramic with a sleek minimalist look. It tracks over 50 health metrics including sleep, heart rate, stress, and metabolic health using adaptive Smart Sensing technology. With up to 8 days of battery life and water resistance up to 100 meters, it offers seamless Bluetooth connectivity to iOS and Android devices, empowering professionals to optimize their health effortlessly.

## Description

Oura Ring 4 - Ceramic Midnight - Size 8 - Smartring | Non-Standard Fit – Measure with Compatible Size Kit | Sleep, Heart Rate and Fitness Tracking Wearable | 8-Day Battery, iOS/Android Supported : desertcart.co.uk: Fashion

## Features

- SIZE BEFORE YOU BUY - Oura Ring sizes are different from standard ring sizes. Size yourself with the Oura Ring 4 Sizing Kit.
- OURA MEMBERSHIP - First month of membership is included with purchase, for new members only. Subscription is 5.99/mo afterwards. Or opt for the annual prepaid option for 69.99. Membership is tied to your account via the Oura App, not your physical ring
- ACCURACY - SMART SENSING - Oura tracks over 50 health metrics, including sleep, activity, stress, heart health, metabolic health,and women’s health metrics. Smart Sensing technology adapts to you — delivering accurate, continuous data, day and night
- LONG LASTING BATTERY - With 5 to 8 days of battery life, no screens and no vibrations, Oura Ring 4 Ceramic allows you to focus on the present. From a workout to a night out — you’re free to forget it’s on. Until you start getting compliments
- DESIGNED FOR 24/7 WEAR - Thoughtfully crafted in high-performance zirconia ceramic, Oura Ring 4 Ceramic combines refined elegance with everyday durability. The updated design is comfortable and is water resistant.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0FKQW8LTZ |
| Age Range Description | Adult |
| Band Colour | Midnight |
| Band Material Type | Ceramic |
| Battery Average Life | 5 days |
| Battery Capacity | 5000 |
| Battery Cell Type | Lithium Polymer |
| Battery Charge Time | 80 minutes |
| Best Sellers Rank | 3,118 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 11 in Wearable Tech Rings |
| Box Contents | Oura Ring 4 Ceramic, Oura Ring 4 Charger, USB Cable |
| Brand Name | OURA |
| Case Material Type | Titanium |
| Cellular Technology | Not Supported |
| Colour | Midnight |
| Communication Feature | Bluetooth |
| Compatible Devices | Smartphone |
| Compatible Phone Models | Android Devices, iOS Devices |
| Connectivity Technology | Bluetooth, USB |
| Controller Type | Proprietary |
| Country of Origin | Estonia |
| Customer Reviews | 4.5 4.5 out of 5 stars (762) |
| Display Type | No Display |
| GPS Geotagging Functionality | No GPS |
| Human Interface Input | Buttons |
| Item Dimensions | 8 x 8 x 4 millimetres |
| Item Dimensions D x W x H | 4D x 8W x 4H millimetres |
| Item Weight | 4.3 Grams |
| Manufacturer | Oura |
| Memory Storage Capacity | 16 MB |
| Metrics Measured | Blood Oxygen (SpO2), Heart Rate, Sleep Duration, Stress |
| Model Name | Oura Ring 4 Ceramic Midnight - Size 8 |
| Model Number | JZ90-57455-08 |
| Operating System | Proprietäres Betriebssystem |
| Product Features | Schlafmonitor, Herzfrequenzmesser, Fitness-Tracker, Stressmonitor, Gesundheitsindex für Damen |
| Product Warranty | 3 year manufacturer warranty |
| RAM Memory Installed | 16 MB |
| Shape | Round |
| Sport Type | Multi-Sports |
| Style Name | Minimalist |
| Supported Application | Heart Rate Monitor |
| Supported Satellite Navigation System | GPS |
| Target Audience | Unisex Adults |
| Warranty Type | Limited |
| Water Resistance Depth | 100 Metres |
| Water Resistance Level | Water Resistant |
| Wearable Computer Type | Smart Ring |
| Wireless Compability | Bluetooth |
| Wireless Provider | Unlocked |

## Product Details

- **Battery capacity:** 5000
- **Battery cell composition:** Lithium Polymer
- **Brand:** OURA
- **Connectivity technology:** Bluetooth, USB
- **GPS:** No GPS
- **Memory storage capacity:** 16 MB
- **Operating system:** Proprietäres Betriebssystem
- **Shape:** Round
- **Special feature:** Schlafmonitor, Herzfrequenzmesser, Fitness-Tracker, Stressmonitor, Gesundheitsindex für Damen
- **Wireless communication standard:** Bluetooth

## Images

![Oura Ring 4 - Ceramic Midnight - Size 8 - Smartring | Non-Standard Fit – Measure with Compatible Size Kit | Sleep, Heart Rate and Fitness Tracking Wearable | 8-Day Battery, iOS/Android Supported - Image 1](https://m.media-amazon.com/images/I/41GwRuOU1iL.jpg)
![Oura Ring 4 - Ceramic Midnight - Size 8 - Smartring | Non-Standard Fit – Measure with Compatible Size Kit | Sleep, Heart Rate and Fitness Tracking Wearable | 8-Day Battery, iOS/Android Supported - Image 2](https://m.media-amazon.com/images/I/41qty4-ZqtL.jpg)
![Oura Ring 4 - Ceramic Midnight - Size 8 - Smartring | Non-Standard Fit – Measure with Compatible Size Kit | Sleep, Heart Rate and Fitness Tracking Wearable | 8-Day Battery, iOS/Android Supported - Image 3](https://m.media-amazon.com/images/I/41n5uHuPLrL.jpg)
![Oura Ring 4 - Ceramic Midnight - Size 8 - Smartring | Non-Standard Fit – Measure with Compatible Size Kit | Sleep, Heart Rate and Fitness Tracking Wearable | 8-Day Battery, iOS/Android Supported - Image 4](https://m.media-amazon.com/images/I/51fdEKHMf6L.jpg)
![Oura Ring 4 - Ceramic Midnight - Size 8 - Smartring | Non-Standard Fit – Measure with Compatible Size Kit | Sleep, Heart Rate and Fitness Tracking Wearable | 8-Day Battery, iOS/Android Supported - Image 5](https://m.media-amazon.com/images/I/41OfRxD4Y5L.jpg)

## Available Options

This product comes in different **Color, Size** options.

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**Shop now:** [https://www.desertcart.uy/products/811946275-oura-ring-4-ceramic-midnight-size-8-smartring-non-standard](https://www.desertcart.uy/products/811946275-oura-ring-4-ceramic-midnight-size-8-smartring-non-standard)

---

*Product available on Desertcart Uruguay*
*Store origin: UY*
*Last updated: 2026-11-09*