---
product_id: 710378271
title: "Sponsored Ad – Oura Ring 4 - Black - Size 8 | Smart Ring Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life"
brand: "oura"
price: "R$8454"
currency: BRL
in_stock: true
url: https://www.desertcart.com.br/products/710378271-sponsored-ad-oura-ring-4-black-size-8-smart-ring
store_origin: BR
region: Brazil
---

# Continuous heart rate monitoring In-depth sleep & activity analytics Up to 8 days battery life Sponsored Ad – Oura Ring 4 - Black - Size 8 | Smart Ring Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life

**Brand:** oura
**Price:** R$8454
**Availability:** ✅ In Stock

## Summary

> 💍 Own your health journey with the smartest ring on your finger

## Quick Answers

- **What is this?** Sponsored Ad – Oura Ring 4 - Black - Size 8 | Smart Ring Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life by oura
- **How much does it cost?** R$8454 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/710378271-sponsored-ad-oura-ring-4-black-size-8-smart-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

- • **Style meets science:** Multiple finishes and sizes for a perfect fit and statement look
- • **Data that drives your day:** Seamless smartphone app sync delivers personalized health analytics
- • **Know your body like never before:** Advanced heart rate and sleep tracking for optimized wellness
- • **All-day comfort, all-night insight:** Sleek, compact design for effortless wear 24/7
- • **Stay powered longer, charge smarter:** Up to 8 days battery life with wireless charging convenience

## Overview

The Oura Ring 4 is a sleek, smart wearable designed for continuous health monitoring, featuring advanced heart rate and sleep tracking, up to 8 days of battery life with wireless charging, and seamless app integration—all wrapped in customizable styles for everyday comfort and professional appeal.

## Description

Sponsored Ad – Oura Ring 4 - Black - Size 8 | Smart Ring Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life

## 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 | B0D9WVR866 |
| Batteries | 1 Lithium Polymer batteries required. (included) |
| Best Sellers Rank | #38 in Electronics ( See Top 100 in Electronics ) #1 in Smart Rings |
| Color | Black |
| Connectivity technologies | Bluetooth |
| Customer Reviews | 4.2 4.2 out of 5 stars (7,696) |
| Date First Available | October 3, 2024 |
| GPS | GPS Via Smartphone |
| Human Interface Input | Unknown |
| Item Weight | 6.4 ounces |
| Item model number | JZ90-54144-08 |
| Manufacturer | Oura |
| OS | Proprietary Operating System |
| Other display features | Wireless |
| Product Dimensions | 0.98 x 0.98 x 0.28 inches |
| Special features | Activity Tracker, Cycle Tracking, Daily Workout Memory, Lightweight |
| Whats in the box | Oura Ring 4, Oura Ring 4 Charger, USB Cable, Information Booklet, Quick Start Guide |

## Product Details

- **Operating system:** Proprietary Operating System
- **Special feature:** Activity Tracker
- **Connectivity technology:** Bluetooth, Wi-Fi, Proprietary Wireless Protocol
- **Wireless communication standard:** Bluetooth
- **Battery cell composition:** Lithium Polymer
- **GPS:** No GPS
- **Shape:** Ring
- **Brand:** OURA
- **Model name:** Oura Ring 4 - Black - Size 8
- **Style:** Modern

## Images

![Sponsored Ad – Oura Ring 4 - Black - Size 8 | Smart Ring Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life - Image 1](https://m.media-amazon.com/images/I/513EeiCr+QL.jpg)
![Sponsored Ad – Oura Ring 4 - Black - Size 8 | Smart Ring Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life - Image 2](https://m.media-amazon.com/images/I/51f7Md52AIL.jpg)
![Sponsored Ad – Oura Ring 4 - Black - Size 8 | Smart Ring Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life - Image 3](https://m.media-amazon.com/images/I/71jVxf3HxrL.jpg)
![Sponsored Ad – Oura Ring 4 - Black - Size 8 | Smart Ring Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life - Image 4](https://m.media-amazon.com/images/I/613EYvr-lAL.jpg)
![Sponsored Ad – Oura Ring 4 - Black - Size 8 | Smart Ring Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life - Image 5](https://m.media-amazon.com/images/I/61FFomT0clL.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 - 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.com.br/products/710378271-sponsored-ad-oura-ring-4-black-size-8-smart-ring](https://www.desertcart.com.br/products/710378271-sponsored-ad-oura-ring-4-black-size-8-smart-ring)

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-01-23*