---
product_id: 661324911
title: "Ring 4 Smart Ring - Black - Size 8 | Sleep, Activity, Women’s Health, AI Advisor, Up to 8 Days of Battery Life, Size Before You Buy, Android & iOS Compatible"
brand: "oura"
price: "88909 kr"
currency: ISK
in_stock: true
category: "Oura"
url: https://www.desertcart.is/products/661324911-ring-4-smart-ring-black-size-8-sleep-activity-women
store_origin: IS
region: Iceland
---

# 8-day battery life 100m water resistant 50+ health metrics tracked Ring 4 Smart Ring - Black - Size 8 | Sleep, Activity, Women’s Health, AI Advisor, Up to 8 Days of Battery Life, Size Before You Buy, Android & iOS Compatible

**Brand:** oura
**Price:** 88909 kr
**Availability:** ✅ In Stock

## Summary

> 💍 Own your health journey with the ring that works as hard as you do.

## Quick Answers

- **What is this?** Ring 4 Smart Ring - Black - Size 8 | Sleep, Activity, Women’s Health, AI Advisor, Up to 8 Days of Battery Life, Size Before You Buy, Android & iOS Compatible by oura
- **How much does it cost?** 88909 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/661324911-ring-4-smart-ring-black-size-8-sleep-activity-women)

## 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

- • **Seamless Style Switch:** Multi-ring support lets you swap finishes via the app to match your mood or outfit.
- • **Effortless All-Day Wear:** Sleek, lightweight titanium design with no screen or vibrations—wear it and forget it.
- • **Extended Battery Freedom:** Up to 8 days of uninterrupted monitoring keeps you focused on life, not charging.
- • **Inclusive Wellness Access:** First month membership included + HSA/FSA eligible for smarter health investment.
- • **Precision Health Insights:** Smart Sensing adapts to your unique biometrics for ultra-accurate tracking day and night.

## Overview

The Oura Ring 4 is a cutting-edge smart ring crafted from titanium, designed to track over 50 health metrics including sleep, activity, stress, and women’s health. Featuring Smart Sensing technology, it delivers personalized, continuous insights with up to 8 days of battery life and 100m water resistance. Its sleek, screen-free design offers comfort and style, while multi-ring support and app integration allow effortless customization. Ideal for health-conscious professionals seeking discreet, data-driven wellness.

## Description

Introducing Oura Ring 4: the latest evolution of the revolutionary smart ring. Oura Ring 4 brings you closer to what matters most — your health. The updated all-titanium design is powered by Smart Sensing, a new sensing platform that doesn’t just measure your biometrics, it adapts to you, providing insights into over 50 health metrics including sleep, readiness, activity, heart health, stress, metabolic health, and women’s health. Oura Ring quietly and comfortably monitors your health and with 5 to 8 days of battery life — you can forget it’s even on. With multi-ring support, change Oura Ring 4 styles as easily as changing your outfit. If you have two or more Oura Ring 4 styles, you can now switch easily between different finishes in the Oura App.

## Features

- ACCURACY - SMART SENSING - Oura tracks over 50 health metrics, including sleep, activity, stress, heart health, and women’s health metrics. Oura Ring 4 is powered by Smart Sensing, which adapts to you — delivering accurate, continuous data, day and night
- ACCURATE SIZING ESSENTIAL - Oura Ring 4 uses unique sizing different from standard jewelry rings; use the Oura Ring 4 Sizing Kit to find your perfect fit before purchasing
- LONG LASTING BATTERY - With up to 8 days of battery life, no screens and no vibrations, Oura Ring 4 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
- OURA MEMBERSHIP - First month of membership is included with purchase, for new members only. Subscription is 5.99/mo afterwards. Membership is tied to your account via the Oura App, not your physical ring
- HSA/FSA ELIGIBLE - We can accept HSA or FSA funds for the following: Oura Ring, additional chargers, and shipping

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D9WVR866 |
| Additional Features | Activity Tracker, Cycle Tracking, Daily Workout Memory, Lightweight |
| Age Range Description | Adult |
| Band Color | Black |
| Band Material Type | Titanium |
| Battery Average Life | 5 days |
| Battery Cell Type | Lithium Polymer |
| Battery Charge Time | 80 minutes |
| Best Sellers Rank | #277 in Electronics ( See Top 100 in Electronics ) #3 in Smart Rings #8 in Activity & Fitness Trackers |
| Brand | OURA |
| Built-In Media | Oura Ring 4, Oura Ring 4 Charger, USB Cable, Information Booklet, Quick Start Guide |
| Case Material Type | Titanium |
| Closure Type | Tang Buckle |
| Color | Black |
| Communication Feature | Bluetooth |
| Compatible Devices | Smartphone |
| Compatible Phone Models | Android Devices, iOS Devices |
| Connectivity Technology | Bluetooth |
| Controller Type | Ring |
| Customer Reviews | 4.0 4.0 out of 5 stars (9,097) |
| Display Type | No Display |
| GPS Geotagging Functionality | GPS Via Smartphone |
| Global Trade Identification Number | 06430060153165 |
| Human Interface Input | Unknown |
| Item Dimensions | 0.98 x 0.98 x 0.28 inches |
| Item Weight | 0.18 kg |
| Manufacturer | Oura |
| Metrics Measured | Body Temperature, Menstrual Cycle, Sleep Duration, Stress |
| Model Name | Oura Ring 4 |
| Model Number | JZ90-54144-08 |
| Operating System | Proprietary Operating System |
| Shape | Round |
| Style Name | Metallic |
| Supported Application | Fitness Tracker |
| Supported Satellite Navigation System | GPS |
| Target Audience | Unisex Adults |
| Warranty Description | 1 Year Manufacturer |
| Warranty Type | Standard/Full |
| Water Resistance Depth | 100 meters |
| Water Resistance Level | Water Resistant |
| Wearable Computer Type | Smart Ring |
| Wireless Compability | Bluetooth |

## Product Details

- **Battery Cell Composition:** Lithium Polymer
- **Brand:** OURA
- **Connectivity Technology:** Bluetooth
- **GPS:** GPS Via Smartphone
- **Model Name:** Oura Ring 4
- **Operating System:** Proprietary Operating System
- **Shape:** Round
- **Special Feature:** Activity Tracker, Cycle Tracking, Daily Workout Memory, Lightweight
- **Style:** Metallic
- **Wireless Communication Standard:** Bluetooth

## Images

![Ring 4 Smart Ring - Black - Size 8 | Sleep, Activity, Women’s Health, AI Advisor, Up to 8 Days of Battery Life, Size Before You Buy, Android & iOS Compatible - Image 1](https://m.media-amazon.com/images/I/51nCNxSwfYL.jpg)

## Available Options

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

## Questions & Answers

**Q: How long should my ring work between charges?**
A: Oura Ring 4 typically lasts 5-8 days on a full charge, depending on usage. Contact Oura Member Care if you have questions or concerns with battery life, and they will ensure your problem is resolved

**Q: How do I choose the right Oura Ring size?**
A: Using the Oura Ring 4 Sizing Kit, choose a finger for your ring. We recommend the index, middle or ring finger. Wear the sizer ring for 24 hours to ensure the fit is secure and comfortable over the course of your day.

**Q: What's included?**
A: Oura Ring 4, Oura Ring 4 Charger, and USB-C Cable.

**Q: How do I see my Oura Ring metrics?**
A: After activating your Oura Ring, you can choose a monthly or annual membership to unlock full access to Oura’s features, daily health and wellness metrics, and personalized guidance.

**Q: Can I use more than one ring?**
A: Oura Members can now connect more than one Oura Ring 4 to their Oura App and quickly switch between them. Note, this feature only supports wearing and syncing data from one active Oura Ring at a time.

## Frequently Bought Together

- Oura Ring 4 - Black - Size 8 - Smart Ring - Size First with Oura Ring 4 Sizing Kit - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days of Battery Life
- sylacor Ring Cover for Oura Ring Gen 4/ Gen 3, Anti-Scratch Elastic Silicone Oura Ring Case Protector for Men Women Working Out Gym

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**Shop now:** [https://www.desertcart.is/products/661324911-ring-4-smart-ring-black-size-8-sleep-activity-women](https://www.desertcart.is/products/661324911-ring-4-smart-ring-black-size-8-sleep-activity-women)

---

*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-09-01*