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Key Features
Key Features
- Size: 8
- Sleep & Rest | Heart Health | Stress | Movement | Women’s Health | Metabolic
- Integrates with 40+ Apps | AI-powered Tools | Automatic Firmware Updates via Oura App
- Seamless Titanium Interior | Non-allergenic Titanium on Inner & Outer Surfaces
- Upto 8 Days Battery Life
- Water Resistant
- 2 Years Warranty
Specifications
Product Category
Ideal For
- Unisex
Wearable Device Type
- Smart Ring
Compatible Devices
- Smartphones
Device Connection Type
- Bluetooth
Manufacturer Details
Brand
- Oura
Model Series
- Ring 4
Model Number
- JZ90-54217-08
Product Dimensions (Open)
Dimensions In CM (WxDxH)
- 0.79 x 0.79 x 0.28
Product Weight
- 3.9 g
Dimensions In Inches (WxDxH)
- 0.31 x 0.31 x 0.11
Features & Functions
Smartphone Application Controls
- Automatic Firmware Updates Via Oura App, Integrates with 40+ Apps
Additional Features/Functions
- Track Over 50 Health and Wellness Metrics, Stress & Women’s Health, Readiness, EMF Safe, Supports Airplane Mode, Metabolic, Sleep & Rest
Health Tracker
- Sleep Monitor | Heart Rate
Features
- Sleep Monitor | Heart Rate
Sensors
- Red & Infrared LEDs Measure Blood Oxygen Levels, Green & Infrared LEDs Alternate to Measure Heart Rate & Heart Rate Variability 24/7 & Respiration Rate, Digital Sensor Measures Temperature Trends, Accelerometer Tracks Movement & Activity 24/7
Compatible OS
- iOS | Android OS
Touch Controls
- No
Physical Attributes
Ring Size
- 8 cm
Network Connectivity
Bluetooth Specifications
- BLE
Bluetooth Supported
- Yes
Wi-Fi Supported
- No
Additional Features
Additional Technology Supported
- Smart Sensing Technology
Battery Details
Maximum Battery Life
- 8 Days
Standard Battery Life
- 5-8 Days
Charging
Wireless Charging Options
- Yes
Battery Charge Time
- Charges in 20 - 80 Minutes
Charging Pin Type
- Charging Dock
Materials & Durability
Resistance Type
- Water Resistant
Resistance Features
- Water Resistant up to 100m/328 ft
Body Material
- Titanium
Aesthetics
Brand Color
- Silver
Color
- SILVER
In The Box
Documents
- 1 x Warranty Card
Main product
- Smart Ring
Accessories
- 1 x Charger, 1 x USB-C Cable
Package Includes
- 1 x Smart Ring, 1 x Charger, 1 x USB-C Cable, 1 x Warranty Card
Generic Name
- Smart Ring
Packaged Dimensions
After Sales & Services
Warranty on Main Product
- 24 Months
Warranty Type
- Carry-In
Standard Warranty Includes
- Manufacturing Defects
Standard Warranty Excludes
- Physical Damage
Installation & Demo applicable
- No
Certification
Additional Certifications
- FCC Certified
Company Contact Information
Customer Support Number
- 18005727662
Customer Support Email
- customersupport@croma.com
Manufacturer/Importer/Marketer Name & Address
- Manufacturer Name & Address: Valdmae poik 3, Tanassilma,76406 Saku vald, Estonia | Importer Name & Address: RASHI PERIPHERALS LIMITED Rashi Complex, Bldg.No.1,1A, 2 & 3, Survey No.186, Poman, Dist: Palghar, Maharashtra - 401208
Country of Origin
- Estonia
Country of Brand Origin
- Finland
Croma Service Promise
Customer Support Email
- customersupport@croma.com
Registered Name and Address
- Infiniti Retail Ltd. - Unit No. 701 & 702, 7th Floor, Kaledonia, Sahar Road, Andheri (East); Mumbai - 400069. India
Customer Support Number
- 1800 572 7662
Customer Care Contact Person
- Grievance Officer
Overview
Accurate Sleep Pattern Analysis
Designed to track total sleep, heart rate variability, nighttime movement, and sleep consistency, this Oura Ring 4 Size 8 Smart Ring delivers a detailed sleep score each morning. In addition, it provides a clear breakdown of deep, REM, and light sleep stages from the previous night. Hence, you can evaluate how well you rested and adjust your daily schedule to support improved recovery.
Holistic Wellness Monitoring
Supporting 24/7 heart rate tracking, blood oxygen sensing, and temperature trend analysis, this size 8 smart ring offers continuous insight into your body’s responses. In addition, metrics such as cardiovascular age, cardio capacity, and heart rate variability help you interpret long-term heart health patterns. Therefore, you can understand how daily routines, stress, and physical effort influence overall well-being.
Daily Readiness Insights
Featuring a Readiness Score, this ring evaluates sleep quality, heart rate, and body temperature trends to indicate how prepared you are for the day. As a result, you can plan workouts, work commitments, or rest periods based on personalised recovery feedback.
Intelligent Activity Tracking
Capable of detecting over 40 activities automatically, this smart ring monitors movement alongside heart rate data. Moreover, personalised activity goals adapt according to your recovery status. Thus, you can maintain a balanced rhythm between movement and rest throughout the week.
Stress Response Insights
Monitoring daytime stress levels and cumulative strain, this ring highlights how your body manages ongoing demands. Hence, you can identify stress patterns and take timely steps to support recovery.
Women’s Cycle Tracking
Using temperature trends, this smart ring delivers cycle insights and period predictions. In addition, integration with compatible apps such as Natural Cycles and Clue allows synced tracking through the Oura app. Therefore, you can monitor menstrual health data with clarity and consistency.
Seamless Smart Connectivity
Compatible with the Oura app on Android and iOS, this ring connects through Bluetooth BLE and supports automatic firmware updates. With 5-8 days of battery life and aeroplane mode availability, you can rely on steady performance with minimal disruption.
Water-Resistant Build
Designed with water resistance up to 100m, this smart ring supports continued use during workouts, showers, or swimming sessions. The durable structure allows dependable tracking across daily activities.
Lightweight Everyday Wear
Weighing between 3.3g and 5.2g depending on the size, this smart ring maintains a light and steady presence on your finger. Its balanced design ensures comfortable extended use, allowing you to monitor your wellbeing consistently without interruption.
Refined Titanium Form
Made from titanium, this Oura ring features a slim and lightweight profile suitable for continuous wear. Its smooth structure sits comfortably on your finger, enabling day and night tracking without inconvenience.







