--- product_id: 734025921 title: "OURA Ring 4 - Black - Size 8 - Smart Ring | Size First Ring 4 Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life" brand: "oura" price: "€ 581.12" currency: EUR in_stock: true reviews_count: 5 url: https://www.desertcart.nl/products/734025921-oura-ring-4-black-size-8-smart-ring-size-first store_origin: NL region: Netherlands --- # Up to 8 days battery life Water resistant for active lifestyles Advanced health & sleep analytics OURA Ring 4 - Black - Size 8 - Smart Ring | Size First Ring 4 Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life **Brand:** oura **Price:** € 581.12 **Availability:** ✅ In Stock ## Summary > 💍 Own your health journey with the smartest ring on your finger. ## Quick Answers - **What is this?** OURA Ring 4 - Black - Size 8 - Smart Ring | Size First Ring 4 Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life by oura - **How much does it cost?** € 581.12 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/734025921-oura-ring-4-black-size-8-smart-ring-size-first) ## 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 - • **Comfort Meets Tech:** Lightweight, sleek black design with unique sizing ensures all-day comfort and perfect fit. - • **Endurance-Ready Battery:** Stay unplugged for up to 8 days—focus on life, not charging. - • **Seamless App Integration:** Effortlessly sync with your smartphone for personalized daily readiness scores and recovery tips. - • **Precision Health Insights:** Track sleep stages, heart rate, body temp & stress with clinical-grade accuracy. - • **Holistic Wellness Companion:** Beyond fitness—mindfulness, guided breathing, and recovery modes tailored for your unique body rhythms. ## Overview The Oura Ring 4 is a sleek, black smart ring designed for advanced health tracking including sleep quality, heart rate, and body temperature. Featuring up to 8 days of battery life and water resistance, it offers seamless Bluetooth syncing with a proprietary app that delivers deep personalized insights and recovery guidance. Its unique sizing ensures a perfect fit, making it a discreet yet powerful wellness companion for professionals seeking data-driven self-care. ## Description Oura Ring 4 - Black - Size 8 - Smart Ring - Unique Sizing, Not Standard US Ring Sizes - Size First - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days of Battery Life : desertcart.in: Jewellery Review: I discovered the Oura Ring 4 through the Clue period tracking app, and it’s been a total game-changer. I live with Chronic Fatigue Syndrome, Fibromyalgia, and AuDHD, and I was looking for something that could help me track sleep, stress, body temperature, and recovery. Oura delivers on all fronts—and then some. What I love most is the accuracy and depth of insight. It doesn’t just give you only the minimal data, like Deep, Light and REM sleep, but also things like how long it takes you to get to sleep (latency) and how restless you are —it then translates this into genuinely helpful feedback, like sleep and recovery scores, body temperature trends, and guided breathing for stress. The daily readiness score helps me pace myself, which is essential when managing fatigue and sensory overwhelm. The breathing and mindfulness sessions have been a great tool during flare-ups or overstimulation. A few things to note: There is a monthly app subscription, but it’s reasonably priced for what you get. I also got a month free when I signed up. The app is intuitive and easy to navigate, though some people might need a bit of time to explore all its features—there are a lot, and they’re all useful. It takes about 90 days for Oura to fully calibrate and understand your individual baseline, so the insights get better over time. Buying the sizing kit first is a MUST—you’ll want a good fit for accuracy and comfort. Tagging activities and meals is super simple (if you remember to do it). The Rest Mode is a thoughtful feature for days when you’re sick, in pain, or recovering, though I do wish stress tracking stayed active during this mode. Battery life is solid, syncing is quick, and the ring itself is lightweight and comfortable—even with sensory sensitivities. It also integrates beautifully with Clue for cycle tracking, which adds another layer of helpful data for me. If you're managing chronic illness, neurodivergence, or just want a deeper, more holistic view of your health, I can’t recommend the Oura Ring 4 enough. It’s not just about fitness—it’s about understanding your body, honoring your limits, and supporting your wellbeing. Review: Delivery took longer than expected, but i am happy with the ring. It does exactly what they advertise. Its a nice to have. ## Features - Advanced Health Tracking, Long Battery Life, Water Resistant, App Integration ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0D9WVR866 | | Batteries | 1 Lithium Polymer batteries required. (included) | | Batteries Included | Yes | | Batteries Required | Yes | | Battery cell composition | Lithium Polymer | | Brand | OURA | | Compatible Devices | Smartphone | | Connector Type | Bluetooth, Wi-Fi, Proprietary Wireless Protocol | | Customer Reviews | 4.0 4.0 out of 5 stars (5,244) | | Date First Available | 3 October 2024 | | Device interface - primary | Unknown | | Display Type | No Display | | Includes Rechargeable Battery | Yes | | Item Dimensions LxWxH | 25 x 25 x 7 Millimeters | | Item Weight | 181 g | | Item model number | JZ90-54144-08 | | Manufacturer | Oura | | Model | JZ90-54144-08 | | Model Name | Oura Ring 4 | | Mounting Hardware | Oura Ring 4, Oura Ring 4 Charger, USB Cable, Information Booklet, Quick Start Guide | | Number of items | 1 | | Operating System | Proprietary Operating System | | Product Dimensions | 2.5 x 2.5 x 0.7 cm; 181 g | | Special Features | Advanced Health Tracking, Long Battery Life, Water Resistant, App Integration | | Wireless Type | Bluetooth | ## Product Details - **Battery Cell Composition:** Lithium Polymer - **Connectivity Technology:** Bluetooth, Wi-Fi, Proprietary Wireless Protocol - **Operating System:** Proprietary Operating System - **Special Feature:** Advanced Health Tracking, Long Battery Life, Water Resistant, App Integration - **Wireless Communication Standard:** Bluetooth ## Images ![OURA Ring 4 - Black - Size 8 - Smart Ring | Size First Ring 4 Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life - Image 1](https://m.media-amazon.com/images/I/61kwtBtcsML.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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by E***A on 28 January 2026* ### ⭐⭐⭐⭐⭐ Review *by S***E on 22 July 2025* I discovered the Oura Ring 4 through the Clue period tracking app, and it’s been a total game-changer. I live with Chronic Fatigue Syndrome, Fibromyalgia, and AuDHD, and I was looking for something that could help me track sleep, stress, body temperature, and recovery. Oura delivers on all fronts—and then some. What I love most is the accuracy and depth of insight. It doesn’t just give you only the minimal data, like Deep, Light and REM sleep, but also things like how long it takes you to get to sleep (latency) and how restless you are —it then translates this into genuinely helpful feedback, like sleep and recovery scores, body temperature trends, and guided breathing for stress. The daily readiness score helps me pace myself, which is essential when managing fatigue and sensory overwhelm. The breathing and mindfulness sessions have been a great tool during flare-ups or overstimulation. A few things to note: There is a monthly app subscription, but it’s reasonably priced for what you get. I also got a month free when I signed up. The app is intuitive and easy to navigate, though some people might need a bit of time to explore all its features—there are a lot, and they’re all useful. It takes about 90 days for Oura to fully calibrate and understand your individual baseline, so the insights get better over time. Buying the sizing kit first is a MUST—you’ll want a good fit for accuracy and comfort. Tagging activities and meals is super simple (if you remember to do it). The Rest Mode is a thoughtful feature for days when you’re sick, in pain, or recovering, though I do wish stress tracking stayed active during this mode. Battery life is solid, syncing is quick, and the ring itself is lightweight and comfortable—even with sensory sensitivities. It also integrates beautifully with Clue for cycle tracking, which adds another layer of helpful data for me. If you're managing chronic illness, neurodivergence, or just want a deeper, more holistic view of your health, I can’t recommend the Oura Ring 4 enough. It’s not just about fitness—it’s about understanding your body, honoring your limits, and supporting your wellbeing. ### ⭐⭐⭐⭐ Review *by D***A on 16 January 2026* Delivery took longer than expected, but i am happy with the ring. It does exactly what they advertise. Its a nice to have. ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.nl/products/734025921-oura-ring-4-black-size-8-smart-ring-size-first](https://www.desertcart.nl/products/734025921-oura-ring-4-black-size-8-smart-ring-size-first) --- *Product available on Desertcart Netherlands* *Store origin: NL* *Last updated: 2026-05-06*