---
product_id: 723998760
title: "Oura Ring 4 - Silver - Size 15 - 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"
brand: "oura"
price: "HK$34"
currency: HKD
in_stock: false
url: https://www.desertcart.hk/products/723998760-oura-ring-4-silver-size-15-smart-ring-unique-sizing
store_origin: HK
region: Hong Kong
---

# Up to 8 days battery life Tracks 30+ biometrics including sleep & stress Water resistant titanium design Oura Ring 4 - Silver - Size 15 - 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

**Brand:** oura
**Price:** HK$34
**Availability:** ❌ Out of Stock

## Summary

> 💍 Elevate your wellness game — the smart ring that’s always one step ahead.

## Quick Answers

- **What is this?** Oura Ring 4 - Silver - Size 15 - 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 by oura
- **How much does it cost?** HK$34 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/723998760-oura-ring-4-silver-size-15-smart-ring-unique-sizing)

## 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

- • **Long-Lasting Freedom:** Enjoy up to 8 days of battery life with no screens or vibrations — focus on living, not charging.
- • **All-Day Smart Sensing:** Continuously monitors 30+ health metrics including heart rate, sleep, activity, and stress with adaptive accuracy.
- • **Seamless App Integration:** Sync effortlessly with 40+ popular health and fitness apps like Apple Health, Strava, and Flo.
- • **Uninterrupted Wearability:** Lightweight, water-resistant titanium ring designed for 24/7 wear — from workouts to nights out.
- • **Precision Sizing, Perfect Fit:** Size yourself with the exclusive Oura Ring 4 Sizing Kit for flawless comfort and style.

## Overview

The Oura Ring 4 is a sleek, all-titanium smart ring designed for continuous 24/7 health tracking. It monitors over 30 biometrics including sleep, heart rate, activity, and stress with adaptive Smart Sensing technology. Featuring up to 8 days of battery life and water resistance, it integrates seamlessly with over 40 apps, making it the ultimate discreet fitness and wellness companion for professionals on the go.

## Description

Full description not available

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | OURA |
| Manufacturer | Oura |
| Model | JZ90-54217-15 |
| Product Dimensions | 2.5 x 2.5 x 0.8 cm; 180 g |
| Batteries | 1 Lithium Polymer batteries required. (included) |
| Item model number | JZ90-54217-15 |
| Compatible Devices | Smartphone |
| Mounting Hardware | Oura Ring 4, Oura Ring 4 Charger, USB Cable, Information Booklet, Quick Start Guide |
| Number of items | 1 |
| Display Type | Analog |
| Batteries Included | Yes |
| Batteries Required | Yes |
| Battery cell composition | Lithium Polymer |
| Wireless Type | Bluetooth |
| Connector Type | Bluetooth |
| Device interface - primary | Unknown |
| Includes Rechargeable Battery | Yes |
| Manufacturer | Oura |
| Item Weight | 180 g |

## Product Details

- **Connectivity Technology:** Bluetooth
- **Wireless Communication Standard:** Bluetooth
- **Battery Cell Composition:** Lithium Polymer
- **GPS:** No GPS
- **Shape:** Round

## Images

![Oura Ring 4 - Silver - Size 15 - 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 - Image 1](https://m.media-amazon.com/images/I/51ul5++ZdWL.jpg)
![Oura Ring 4 - Silver - Size 15 - 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 - Image 2](https://m.media-amazon.com/images/I/51zzz4L0duL.jpg)
![Oura Ring 4 - Silver - Size 15 - 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 - Image 3](https://m.media-amazon.com/images/I/71DARsfmjCL.jpg)
![Oura Ring 4 - Silver - Size 15 - 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 - Image 4](https://m.media-amazon.com/images/I/713l574H8CL.jpg)
![Oura Ring 4 - Silver - Size 15 - 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 - Image 5](https://m.media-amazon.com/images/I/7102nfIc79L.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 15 - Smart Ring - Size First with Oura Ring 4 Sizing Kit - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days of Battery Life
- Oura Ring 4 Charger - Size 15 - Charging Dock and USB-C Cable - Charges Oura Ring 4 up to 8 Days

---

## 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.hk/products/723998760-oura-ring-4-silver-size-15-smart-ring-unique-sizing](https://www.desertcart.hk/products/723998760-oura-ring-4-silver-size-15-smart-ring-unique-sizing)

---

*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-03-21*