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Key Features
Key Features
- Size: 9
- 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
- JZ90-54144-09
Product Dimensions (Open)
Dimensions In CM (WxDxH)
- 0.79 x 0.79 x 0.28
Product Weight
- 4.2 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
- Heart Rate | Sleep Monitor
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
- Android OS | iOS
Touch Controls
- No
Physical Attributes
Ring Size
- 9
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
- Black
Color
- BLACK
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
Enhanced Sleep Monitoring
Designed to analyse total sleep duration, heart rate variability, nighttime movement, and sleep consistency, this Oura Ring 4 Size 9 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 understand your rest patterns and make informed adjustments to your bedtime routine.
Real-Time Health Intelligence
Supporting 24/7 heart rate tracking, blood oxygen sensing, and temperature trend analysis, this size 9 smart ring delivers continuous body insights throughout the day and night. Features such as cardiovascular age, cardio capacity, and heart rate variability offer meaningful context about long-term heart health. Therefore, you can observe how lifestyle habits, stress levels, and recovery influence your overall wellbeing.
Smart Readiness Tracking
Featuring a daily Readiness Score, this ring evaluates sleep quality, heart rate trends, and temperature changes to indicate how prepared your body is for activity. As a result, you can plan workouts, work commitments, or rest periods based on personalised recovery feedback.
Automatic Activity Detection
Capable of recognising over 40 activities automatically, this smart ring tracks movement patterns alongside heart rate data. In addition, personalised activity goals adjust according to your recovery levels. Thus, you can maintain a balanced approach between daily movement and adequate rest.
Stress and Resilience Insights
Monitoring daytime stress, cumulative strain, and recovery signals, this ring highlights how your body responds to physical and mental demands. Hence, you can identify stress triggers and build resilience gradually through better recovery habits.
Women’s Health Support
Using temperature trends, this smart ring provides cycle insights and period predictions. Moreover, it integrates with compatible apps such as Natural Cycles and Clue through the Oura app. Therefore, you can track menstrual health data with synced and consistent updates.
Smart Connectivity
Compatible with the Oura app on Android and iOS, this ring connects via Bluetooth BLE and supports automatic firmware updates. With 5-8 days of battery life and aeroplane mode support, you can rely on uninterrupted tracking across daily routines.
Reliable Water Resistance
Designed with water resistance up to 100m, this smart ring supports use during workouts, showers, or swimming sessions. The durable construction withstands regular exposure to moisture, so you can continue tracking without removing the ring.
Subtle Weight Design
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 Design
Made from titanium, this Oura ring offers a lightweight and streamlined profile suited for continuous wear. Its smooth structure sits comfortably on your finger, allowing you to wear it throughout work, rest, and activity with ease.








