---
product_id: 676576159
title: "Ring 4 | Smart Ring | Size First with Oura Ring 4 Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life"
brand: "oura"
price: "S$644"
currency: SGD
in_stock: true
reviews_count: 13
category: "Oura"
url: https://www.desertcart.sg/products/676576159-ring-4-smart-ring-size-first-with-oura-ring-4
store_origin: SG
region: Singapore
---

# 8 days battery life 30+ biometric sleep & health metrics Water-resistant titanium design Ring 4 | Smart Ring | Size First with Oura Ring 4 Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life

**Brand:** oura
**Price:** S$644
**Availability:** ✅ In Stock

## Summary

> 💍 Own your wellness journey with the smartest ring on your finger.

## Quick Answers

- **What is this?** Ring 4 | Smart Ring | Size First with Oura Ring 4 Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life by oura
- **How much does it cost?** S$644 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/676576159-ring-4-smart-ring-size-first-with-oura-ring-4)

## 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

- • **Unplug & Go:** Up to 8 days of battery life keeps you powered through work, workouts, and weekends.
- • **Precision Meets Comfort:** Smart Sensing tech tracks 30+ biometrics for personalized insights.
- • **Size First, Perfect Fit:** Exclusive sizing kit ensures your Oura Ring fits flawlessly before you buy.
- • **Wear It All Day, Every Day:** Sleek, lightweight titanium ring designed for 24/7 comfort and durability.
- • **Seamless Health Integration:** Syncs effortlessly with your smartphone for real-time heart rate, sleep, and activity tracking.

## Overview

The Oura Ring 4 is a sleek, all-titanium smart ring designed for continuous 24/7 wear, tracking over 30 biometric signals including sleep, heart rate, and activity. It offers up to 8 days of battery life without screens or vibrations, ensuring a distraction-free experience. With a unique sizing kit for a perfect fit and water resistance, it blends durability with comfort. The ring pairs with the Oura app, providing personalized health insights backed by Smart Sensing technology.

## Description

Oura Ring 4 - Black - Size 12 - Smart Wearable | Size First with Oura 4 Sizing Kit | Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days Battery Life : desertcart.ae: Electronics

Review: dying battery render the ring useless, free replacement seamlessly provided - Product works as expected and is hepful. After 7 months of usage battery is dying, resisiting less than one day after full charged. I contacted the seller, and free replacement arrived in couple of days, no need to return the mafunctioning one. As such, a one star reviewe turned into a 5 stars.
Review: Life changing if you’re willing to put the work in - I’ve had it for a month now and I can say it really keeps me on track not necessarily health and fitness but more habits and trends. I think everyone can benefit from it. It came neatly packaged and sealed 100% new and after wearing every day I definitely have a lot of small scratches (and I take it off for showering doing dishes etc) but not visible to the normal eye

## Features

- SIZE BEFORE YOU BUY - Oura Ring 4 sizes are different from standard ring sizes. Size yourself with the Oura Ring 4 Sizing Kit and receive a dh35.00 desertcart credit towards the future purchase of an Oura Ring 4.
- OURA MEMBERSHIP - First month of membership is free with your purchase, $6.99/mo afterwards. Offer available to new members only. Or opt for the annual prepaid option for $79.99. Membership is tied to your account via the Oura App, not your physical ring.
- ACCURACY - SMART SENSING - Oura tracks over 30 biometrics, 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.
- 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.
- DESIGNED FOR 24/7 WEAR - The updated design of the Oura Ring 4 is more comfortable, fits better than ever, and is water resistant. The first all-titanium smart ring combines exceptional durability with a gentle touch, even for sensitive skin.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D9WW4ZHX |
| Additional Features | Heart Rate Monitor |
| Age Range Description | Adult |
| Band Color | black |
| Band Material Type | Titanium |
| Battery Average Life | 8 days |
| Battery Capacity | 8 |
| Battery Cell Type | Lithium Polymer |
| Battery Charge Time | 80 minutes |
| Best Sellers Rank | #12,301 in Electronics ( See Top 100 in Electronics ) #41 in Wearable Tech Rings |
| Brand | OURA |
| Built-In Media | Information Booklet, Oura Ring 4, Oura Ring 4 Charger, Quick Start Guide, USB-C Cable |
| Case Material Type | Titanium |
| Closure Type | Ring |
| Color | Black |
| Communication Feature | Bluetooth |
| Compatible Devices | Smartphone, Tablet |
| Compatible Phone Models | Compatible with iOS and Android devices |
| Connectivity Technology | Bluetooth |
| Controller Type | Ring |
| Country of Origin | Estonia |
| Customer Reviews | 4.1 4.1 out of 5 stars (7,043) |
| Display Type | No Display |
| GPS Geotagging Functionality | GPS Via Smartphone |
| Global Trade Identification Number | 06430060153202 |
| Human Interface Input | Buttons |
| Item Dimensions | 22 x 22 x 7 millimeters |
| Item Dimensions D x W x H | 22D x 22W x 7H millimeters |
| Manufacturer | Oura |
| Metrics Measured | accelerometer, optical heart rate sensor, other (unspecified) |
| Model Name | Oura Ring 4 - Black - Size 12 |
| Model Number | JZ90-54144-12 |
| Operating System | Android |
| Shape | Round |
| Style Name | Modern |
| Supported Application | Fitness Tracker |
| Supported Satellite Navigation System | GPS |
| Target Audience | Unisex Adults |
| Warranty Description | 2 year manufacturer warranty |
| 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 capacity:** 8
- **Connectivity technology:** Bluetooth
- **Operating system:** Android
- **Special features:** Heart Rate Monitor
- **Wireless communication standard:** Bluetooth

## Images

![Ring 4 | Smart Ring | Size First with Oura 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/51nCNxSwfYL.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

### ⭐⭐⭐⭐⭐ dying battery render the ring useless, free replacement seamlessly provided
*by R***U on 26 August 2025*

Product works as expected and is hepful. After 7 months of usage battery is dying, resisiting less than one day after full charged. I contacted the seller, and free replacement arrived in couple of days, no need to return the mafunctioning one. As such, a one star reviewe turned into a 5 stars.

### ⭐⭐⭐⭐⭐ Life changing if you’re willing to put the work in
*by K***O on 22 June 2025*

I’ve had it for a month now and I can say it really keeps me on track not necessarily health and fitness but more habits and trends. I think everyone can benefit from it. It came neatly packaged and sealed 100% new and after wearing every day I definitely have a lot of small scratches (and I take it off for showering doing dishes etc) but not visible to the normal eye

### ⭐ Battery issue
*by A***Y on 16 February 2026*

After 5 months of usage battery capacity decreased to ~ 1.5 day. Sometimes during the night ring hangs and does not provide sleep metrics at all. This issue also seems to be related to battery malfunction. Latest firmware and soft resets do not help.

## Frequently Bought Together

- Oura Ring 4 - Black - Size 12 - 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.sg/products/676576159-ring-4-smart-ring-size-first-with-oura-ring-4](https://www.desertcart.sg/products/676576159-ring-4-smart-ring-size-first-with-oura-ring-4)

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-05-08*