---
product_id: 722783660
title: "Ring 4 - Black - Size 9 - Smart Ring | Size First Ring 4 Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life"
brand: "oura"
price: "2529 zł"
currency: PLN
in_stock: true
reviews_count: 5
url: https://www.desertcart.pl/products/722783660-ring-4-black-size-9-smart-ring-size-first-ring
store_origin: PL
region: Poland
---

# Up to 8 Days Battery Life Advanced Sleep & Activity Tracking 24/7 Heart Rate Monitor Ring 4 - Black - Size 9 - Smart Ring | Size First Ring 4 Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life

**Brand:** oura
**Price:** 2529 zł
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** Ring 4 - Black - Size 9 - 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?** 2529 zł with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/722783660-ring-4-black-size-9-smart-ring-size-first-ring)

## 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

- • **Power That Lasts:** Up to 8 days of battery life keeps you unplugged and unstoppable
- • **Sleep Like a Pro:** Deep sleep analysis to optimize your nightly recovery
- • **All-Day Heart Insight:** Continuous heart rate monitoring for smarter wellness decisions
- • **Sleek, Discreet Design:** Minimalist black ring that fits your style and your lifestyle
- • **Tailored Fit, Unique Sizing:** Custom sizing ensures comfort and precision tracking every time

## Overview

The Oura Ring 4 is a sleek, black smart ring designed for continuous heart rate monitoring, advanced sleep and activity tracking, and up to 8 days of battery life. Featuring unique sizing for a perfect fit, it syncs seamlessly with your smartphone via Bluetooth, empowering professionals to optimize health and performance discreetly and stylishly.

## Description

Oura Ring 4 - Black - Size 9 - 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

- Heart Rate Monitor, Activity Tracker

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D9WTFDBF |
| Batteries | 1 Lithium Polymer batteries required. (included) |
| Batteries Included | Yes |
| Batteries Required | Yes |
| Battery cell composition | Lithium Polymer |
| Brand | OURA |
| Compatible Devices | Smartphone |
| Customer Reviews | 4.0 4.0 out of 5 stars (4,996) |
| Date First Available | 3 October 2024 |
| Device interface - primary | Buttons |
| Display Type | No Display |
| Includes Rechargeable Battery | Yes |
| Item Dimensions LxWxH | 26 x 26 x 7 Millimeters |
| Item Weight | 191 g |
| Item model number | JZ90-54144-09 |
| Manufacturer | Oura |
| Model | JZ90-54144-09 |
| Model Name | JZ90-54144-09 |
| 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 | 2.6 x 2.6 x 0.7 cm; 191 g |
| Special Features | Heart Rate Monitor, Activity Tracker |
| Wireless Type | Bluetooth |

## Product Details

- **Battery Cell Composition:** Lithium Polymer
- **Operating System:** [Proprietary operating system]
- **Shape:** Ring
- **Special Feature:** Heart Rate Monitor, Activity Tracker
- **Wireless Communication Standard:** Bluetooth

## Images

![Ring 4 - Black - Size 9 - 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)

## 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 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.

### ⭐⭐⭐⭐⭐ Review
*by U***A on 31 July 2025*

Najlepszy tracker samopoczucia i dobrostanu

## Frequently Bought Together

- Oura Ring 4 - Black - Size 9 - 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.pl/products/722783660-ring-4-black-size-9-smart-ring-size-first-ring](https://www.desertcart.pl/products/722783660-ring-4-black-size-9-smart-ring-size-first-ring)

---

*Product available on Desertcart Poland*
*Store origin: PL*
*Last updated: 2026-06-12*