---
product_id: 725327900
title: "Ring Generation 4 Smart Ring - Silver - Size 7 | SIZE CHECK FIRST: Includes Exclusive Size Kit | Monitor Sleep, Heart Rate & Fitness | Battery Lasts Up to 8 Days"
brand: "oura"
price: "¥106633"
currency: JPY
in_stock: true
reviews_count: 13
url: https://www.desertcart.jp/products/725327900-ring-generation-4-smart-ring-silver-size-7-size-check
store_origin: JP
region: Japan
---

# 8-day battery life 24/7 advanced sleep tracking 20+ health metrics monitored Ring Generation 4 Smart Ring - Silver - Size 7 | SIZE CHECK FIRST: Includes Exclusive Size Kit | Monitor Sleep, Heart Rate & Fitness | Battery Lasts Up to 8 Days

**Brand:** oura
**Price:** ¥106633
**Availability:** ✅ In Stock

## Summary

> 💍 Elevate your wellness game with the ring that works as hard as you do.

## Quick Answers

- **What is this?** Ring Generation 4 Smart Ring - Silver - Size 7 | SIZE CHECK FIRST: Includes Exclusive Size Kit | Monitor Sleep, Heart Rate & Fitness | Battery Lasts Up to 8 Days by oura
- **How much does it cost?** ¥106633 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/725327900-ring-generation-4-smart-ring-silver-size-7-size-check)

## 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

- • **All-Day Health Insights:** Track 20+ vital metrics including heart rate, stress, and women’s health with aerospace-grade titanium durability.
- • **Precision Fit Guaranteed:** Exclusive sizing kit ensures your perfect Oura Ring fit—no guesswork, just comfort.
- • **Sleek & Resilient Design:** Waterproof, lightweight titanium ring that blends seamlessly with your professional style.
- • **Seamless Smart Connectivity:** Bluetooth-enabled for effortless syncing with iOS and Android devices—your health data, always at your fingertips.
- • **Unmatched Battery Endurance:** Up to 8 days of uninterrupted monitoring—stay connected to your wellness without daily charging.

## Overview

The Oura Ring Generation 4 is a sleek, titanium smart ring designed for continuous 24/7 health monitoring. It tracks over 20 biometric metrics including sleep, heart rate, stress, and women’s health indicators with outstanding accuracy. Featuring up to 8 days of battery life and a waterproof, durable design, it offers a comfortable fit verified by an exclusive sizing kit. Compatible with both iOS and Android devices via Bluetooth, it’s the ultimate wearable for professionals seeking discreet, data-driven wellness insights.

## Description

Introducing the Oura Ring 4 — the next generation smart ring that has evolved. With your health first, the Oura Ring 4 has a new design made from all titanium, and "smart sensing" that adapts to you beyond just measures. Quietly and comfortably monitor over 30 biometrics including sleep, recovery, activity, heart health, stress, and women's health. With up to 8 days of battery life, you'll forget you have it on.

Review: 包裝完整，符合期待
Review: Works great - Thought it would be more chunky but it’s not. Accurately tracks my workout heart rate and sleep

## Features

- 【 MEASURE THE SIZE BEFORE PURCHASING 】 - The size of the Oura Ring 4th Generation differs from the general ring size By measuring with the dedicated size kit before purchase, you can find the perfect size Additionally, you will receive a 1,500 yen desertcart credit that can be used for future purchases of the Oura Ring
- 【 Outstanding Accuracy 】 - Oura tracks over 20 health metrics including sleep, activity, stress, heart health, and women's health indicators By utilizing cutting-edge sensing technology, it adapts to the unique physiological functions of the user, providing accurate and continuous data throughout 24 hours
- 【 Long-lasting Battery 】 - With up to 8 days of battery life, without screen or vibration, the Oura Ring 4 enables mindfulness From workouts to evening outings, you can be free and forget you are wearing it Until you start getting compliments
- 【 24-hour wear design 】 - The updated design of the Oura Ring 4 is more comfortable and fits better than ever, with 100m waterproof performance One of the toughest materials on Earth, aerospace-grade titanium combines a gentle touch for sensitive skin with exceptional durability

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D9WW6RPJ |
| Additional Features | Activity Tracker |
| Age Range Description | Adult |
| Amazon Bestseller | #2,795 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #4 in Activity & Fitness Trackers |
| Band Color | slivery |
| Battery Average Life | 8 days |
| Battery Cell Type | Lithium Polymer |
| Battery Charge Time | 80 minutes |
| Brand | OURA |
| Built-In Media | Oura Ring 8 Charger, USB Cable, Information Booklet, Quick Start Guide |
| Case Material Type | Titanium |
| Color | Silver |
| Compatible Devices | Smartphone, Tablet |
| Compatible Phone Models | Android Devices, iOS Devices |
| Connectivity Technology | Bluetooth |
| Country of Origin | Estonia |
| Customer Reviews | 4.2 4.2 out of 5 stars (2,485) |
| GPS Geotagging Functionality | No GPS |
| Human Interface Input | Buttons |
| Item Dimensions | 24 x 24 x 7 mm |
| Item Dimensions D x W x H | 24D x 24W x 7H mm |
| Manufacturer | Oura |
| Memory Storage Capacity | 4 GB |
| Metrics Measured | Blood Oxygen (SpO2), Heart Rate, Sleep Duration, Stress |
| Model Number | JZ90-54217-07 |
| Shape | Round |
| Target Audience | Unisex Adults |
| Warranty Description | 2 Year Warranty |
| Water Resistance Level | Water Resistant |
| Wearable Computer Type | Smart Ring |
| Wireless Compability | Bluetooth |

## Product Details

- **Battery Cell Composition:** Lithium Polymer
- **Connectivity Technology:** Bluetooth
- **Memory Storage Capacity:** 4 GB
- **Special Feature:** Activity Tracker
- **Wireless Communication Standard:** Bluetooth

## Images

![Ring Generation 4 Smart Ring - Silver - Size 7 | SIZE CHECK FIRST: Includes Exclusive Size Kit | Monitor Sleep, Heart Rate & Fitness | Battery Lasts Up to 8 Days - Image 1](https://m.media-amazon.com/images/I/61VwOjlW1AL.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 邊***琪 on March 5, 2026*

包裝完整，符合期待

### ⭐⭐⭐⭐⭐ Works great
*by P***Y on February 13, 2026*

Thought it would be more chunky but it’s not. Accurately tracks my workout heart rate and sleep

### ⭐⭐⭐⭐⭐ Review
*by L***S on December 9, 2025*

事前にサイズキットを購入して１，２日候補となる指でつけて生活することはマストです。 Ouraリングそのものはデータが好きな人間にとって最高のツールです。 結構厚みもありますが、日常生活で邪魔に感じることはほとんどなく日常の一部になっています。

## Frequently Bought Together

- Oura Ring 4 - Silver - Size 7 - 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
- ZOOROO 2-Pack 14K Gold Plated Stacking Rings for Oura Gen 4/Oura Gen 3, Cubic Zirconia Simulated Diamond Oura Ring Stack for Women

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**Shop now:** [https://www.desertcart.jp/products/725327900-ring-generation-4-smart-ring-silver-size-7-size-check](https://www.desertcart.jp/products/725327900-ring-generation-4-smart-ring-silver-size-7-size-check)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-05-23*