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  • 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

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    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.

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