---
product_id: 703350407
title: "Oura Smart Ring 4 - Silver - Size 8 - | Non-Standard Fit – Measure with a Size Kit |Sleep, Heart Rate and Fitness Tracking Wearable | 8-Day Battery, iOS / Android Compatible"
brand: "oura"
price: "€ 560.29"
currency: EUR
in_stock: true
category: "Oura"
url: https://www.desertcart.fi/products/703350407-oura-smart-ring-4-silver-size-8-non-standard-fit
store_origin: FI
region: Finland
---

# 8-day battery life IP68 water resistant 30+ biometric sensors Oura Smart Ring 4 - Silver - Size 8 - | Non-Standard Fit – Measure with a Size Kit |Sleep, Heart Rate and Fitness Tracking Wearable | 8-Day Battery, iOS / Android Compatible

**Brand:** oura
**Price:** € 560.29
**Availability:** ✅ In Stock

## Summary

> 💍 Own your health, style, and edge—wear the future on your finger.

## Quick Answers

- **What is this?** Oura Smart Ring 4 - Silver - Size 8 - | Non-Standard Fit – Measure with a Size Kit |Sleep, Heart Rate and Fitness Tracking Wearable | 8-Day Battery, iOS / Android Compatible by oura
- **How much does it cost?** € 560.29 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/703350407-oura-smart-ring-4-silver-size-8-non-standard-fit)

## 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

- • **Tailored Fit Guarantee:** Sizing kit included for a perfect, non-standard fit that feels custom-made.
- • **Effortless All-Day Wear:** Sleek titanium design ensures lightweight comfort from workouts to nights out.
- • **Seamless Smartphone Sync:** Bluetooth-enabled app integration delivers personalized analytics anytime, anywhere.
- • **Unmatched Battery Freedom:** Up to 8 days of continuous tracking with fast wireless charging—ditch nightly plugs.
- • **Next-Level Health Insights:** Track heart rate, sleep, activity, stress, and women’s health with precision.

## Overview

The Oura Smart Ring 4 is a titanium-crafted wearable that delivers advanced health monitoring with over 30 biometric sensors, including heart rate, sleep, and activity tracking. It boasts an 8-day battery life, IP68 water resistance, and seamless Bluetooth app integration compatible with iOS and Android. Designed for comfort and durability, it offers a personalized fit via a sizing kit, making it the ultimate discreet health companion for the modern professional.

## Description

From the manufacturer Size before you buy Easy to wear, everywhere No interruptions Built to last Accurate by design The Oura Ring 4 Sizing Kit is the best way to ensure an accurate experience. Sleek and comfortable, Oura Ring seamlessly fits into your life from a workout to a night out. Stay present without notifications on your wrist. Check the Oura App when you want to. Oura Ring 4 is fully titanium: one of the strongest metals on earth. Durable, lightweight, and water resistant. Oura Ring 4 delivers incredibly accurate data and personalised health insights to help you be at your best. Fully Titanium Oura Ring 4 is fully titanium: one of the strongest metals on earth. Durable, lightweight, water resistant. Fully Titanium Oura Ring 4 is fully titanium: one of the strongest metals on earth. Durable, lightweight, water resistant. Smart Sensing A first-of-its-kind sensing platform, Smart Sensing adapts to your unique finger, ensuring continuous, accurate data from over 30 biometrics - day and night. Smart Sensing A first-of-its-kind sensing platform, Smart Sensing adapts to your unique finger, ensuring continuous, accurate data from over 30 biometrics - day and night. Long battery life Up to 8 days of battery means you can track your health 24/7 without charging every night. Long battery life Up to 8 days of battery means you can track your health 24/7 without charging every night. Always Wearable Oura Ring 4 is more comfortable with a fully round interior with discreet, recessed sensors. It's water resistant and can withstand heat, and cold. Always Wearable Oura Ring 4 is more comfortable with a fully round interior with discreet, recessed sensors. It's water resistant and can withstand heat, and cold. Sleep Activity Readiness Stress Heart Health Women’s Health Wake up to in-depth sleep analysis, so you can improve your habits and transform how you feel. Whether running a marathon or running errands, Oura tracks your daily activity and workouts while helping you strike a balance between movement and recovery. Know when to push it and when to take it easy. Your Readiness Score tells you how energised you are using over 50 biometrics - it can even tell when you might be getting sick. Oura will help you identify signs of stress and understand how well your body handles it. You'll know when you need to incorporate more self-care practises and how to recover from long term stressors. From monitoring your daily heart rate and HRV to discovering your Cardiovascular Age and Cardio Capacity, Oura helps you take care of one of the key indicators of your overall health - your heart. Your cycle impacts your mood, sleep, activity and more, every day. Oura helps you understand how your cycle affects your body, so you can make better, informed decisions about your holistic health. Size Before You Buy Step 1 Purchase an Oura Ring 4 Sizing Kit and receive a £10 credit towards your Oura Ring. Step 2 Advanced health monitoring capabilities, including heart rate, sleep patterns, and activity tracking. Step 3 Slip on your Oura Ring 4 and download the Oura App. Step 4 New members get the first month of Oura Membership free, then it’s £5.99 per month. Oura Ring 4 What's in the Box Oura Ring 4 Charger and USB-C Cable

## Features

- Compact and intelligent design for comfortable everyday wear
- Advanced health monitoring capabilities, including heart rate, sleep patterns, and activity tracking
- Long battery life with convenient wireless charging
- Seamless smartphone app integration for detailed health and activity analytics
- Available in multiple finishes and sizes for personalized style

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D9WVSZ56 |
| Age Range Description | Adult |
| Band Colour | Silver |
| Band Material Type | Titanium |
| Battery Average Life | 8 days |
| Battery Capacity | 26 Milliamp Hours |
| Battery Cell Type | Lithium Polymer |
| Battery Charge Time | 80 minutes |
| Battery capacity | 26 Milliamp Hours |
| Best Sellers Rank | 239 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 2 in Wearable Tech Rings |
| Box Contents | Information Booklet, Oura Ring 4, Oura Ring 4 Charger, Quick Start Guide, USB-C Cable |
| Brand Name | OURA |
| Case Material Type | Titanium |
| Closure Type | Slip On |
| Colour | Silver |
| Communication Feature | App Integration, Bluetooth |
| Compatible Devices | Smartphone |
| Compatible Phone Models | iOS, Android |
| Connectivity Technology | Bluetooth, USB |
| Connectivity technology | Bluetooth, USB |
| Controller Type | Remote control via smartphone |
| Country of Origin | Estonia |
| Customer Reviews | 4.2 out of 5 stars 8,291 Reviews |
| Display Type | No Display |
| GPS Geotagging Functionality | No GPS |
| Global Trade Identification Number | 06430060153400, 06430060155275 |
| Human Interface Input | Buttons |
| Item Dimensions | 25 x 25 x 7 millimetres |
| Item Dimensions D x W x H | 25D x 25W x 7H millimetres |
| Item Weight | 5.2 Grams |
| Manufacturer | Oura |
| Memory Storage Capacity | 5 MB |
| Memory storage capacity | 5 MB |
| Metrics Measured | optical, accelerometer |
| Model Name | Oura Ring 4 - Silver - Size 8 |
| Model Number | JZ90-54217-08 |
| Operating System | Android |
| Operating system | Android |
| Product Features | Heart Rate Monitor, Activity Tracker |
| Product Warranty | 3 year manufacturer warranty |
| Shape | Ring |
| Special feature | Heart Rate Monitor, Activity Tracker |
| Sport Type | Multi-Sports |
| Style Name | Modern |
| Supported Application | Over 40 apps including Apple Health, Google Health Connect, Natural Cycles, Flo, Strava, & more |
| Supported Satellite Navigation System | GPS |
| Target Audience | Unisex Adult |
| Unit Count | 1.0 count |
| Warranty Type | Lifetime |
| Water Resistance Depth | 1 Metres |
| Water Resistance Level | Water Resistant |
| Waterproof Rating | IP68 |
| Wearable Computer Type | Smart Ring |
| Wireless Compability | Bluetooth |
| Wireless communication standard | Bluetooth |

## Product Details

- **Battery capacity:** 26 Milliamp Hours
- **Battery cell composition:** Lithium Polymer
- **Brand:** OURA
- **Connectivity technology:** Bluetooth, USB
- **GPS:** No GPS
- **Memory storage capacity:** 5 MB
- **Operating system:** Android
- **Shape:** Ring
- **Special feature:** Heart Rate Monitor, Activity Tracker
- **Wireless communication standard:** Bluetooth

## Images

![Oura Smart Ring 4 - Silver - Size 8 - | Non-Standard Fit – Measure with a Size Kit |Sleep, Heart Rate and Fitness Tracking Wearable | 8-Day Battery, iOS / Android Compatible - Image 1](https://m.media-amazon.com/images/I/5155uTN9BPL.jpg)

## Available Options

This product comes in different **Color, Size** 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 - Silver - 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
- ZOOROO 2-Pack 14K Gold Plated Stacking Rings for Oura Gen 4/Oura Gen 3, Cubic Zirconia Simulated Diamond Oura Ring Stack for Women

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**Shop now:** [https://www.desertcart.fi/products/703350407-oura-smart-ring-4-silver-size-8-non-standard-fit](https://www.desertcart.fi/products/703350407-oura-smart-ring-4-silver-size-8-non-standard-fit)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-08-11*