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  • Size: 15
  • 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

    • JZ90-54218-15
  • Product Dimensions (Open)

    • Dimensions In CM (WxDxH)

    • 0.79 x 0.79 x 0.28
    • Product Weight

    • 5.2 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

    • 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

    • Android OS | iOS
    • Touch Controls

    • No
  • Physical Attributes

    • Ring Size

    • 15
  • 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

    • Stealth 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

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    Overview

    Intelligent Sleep Diagnostics

    Designed to track total sleep duration, heart rate variability, nighttime movement, and sleep consistency, this Oura Ring 4 Size 15 Smart Ring delivers a detailed sleep score each morning. In addition, it provides a clear breakdown of deep, REM, and light sleep stages for structured understanding. Hence, you can evaluate how well you rested and refine your bedtime habits with informed decisions.


    Holistic Wellness Monitoring

    Supporting 24/7 heart rate tracking, blood oxygen sensing, and temperature trend analysis, this size 15 smart ring offers continuous physiological data throughout the day and night. In addition, insights such as cardiovascular age, cardio capacity, and heart rate variability present a broader picture of heart performance. Therefore, you can observe how lifestyle patterns, meals, stress, and recovery influence your overall well-being.


    Adaptive Readiness Insights

    Featuring a daily Readiness Score, this ring evaluates sleep quality, heart rate trends, and body temperature signals to indicate how prepared your body is for activity. As a result, you can plan exercise, meetings, or relaxation time based on personalised recovery feedback.


    Seamless Activity Recognition

    Capable of detecting over 40 activities automatically, this smart ring tracks movement patterns along with heart rate response. Moreover, personalised activity goals adjust in line with your recovery data. Thus, you can maintain a thoughtful balance between exertion and rest.


    Stress and Recovery Balance

    Monitoring daytime stress levels, cumulative strain, and resilience trends, this ring highlights how your body reacts to daily demands. Hence, you can identify stress patterns and make adjustments that support long-term balance.


    Women’s Cycle Insights

    Using temperature variations, this smart ring provides cycle tracking and period predictions. Additionally, it integrates with compatible apps such as Natural Cycles and Clue through the Oura app. Therefore, you can manage menstrual health data with synchronised updates.


    Smart App 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 maintain continuous tracking with minimal interruptions.


    Water-Ready Durability

    Designed with water resistance up to 100m, this smart ring supports uninterrupted use during workouts, showers, or swimming. The durable build allows reliable performance in varied daily conditions.


    Effortless Wearability

    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 Build

    Made from titanium, this Oura ring offers a sleek and lightweight structure suited for continuous wear. Its smooth profile sits comfortably on your finger, allowing you to use it throughout work, rest, and activity with ease.

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