Oura Smart Ring 4 Size 9 - Silver (JZ90-54217-09)

Oura Ring 4 – Smart Health Tracking, Evolved

Introducing Oura Ring 4, the latest evolution of the revolutionary smart ring designed to bring you closer to what matters most—your health. Featuring an updated all‑titanium design and powered by Smart Sensing, Oura Ring 4 adapts to your unique body and lifestyle, delivering insights into over 30 essential biometrics, including sleep, readiness, activity, heart health, stress and women’s health. With up to 8 days of battery life, it quietly supports your well‑being—day and night.

Key Features

Smart Sensing for Accurate Insights

Oura Ring 4’s advanced Smart Sensing technology adapts to your finger and daily activity, offering precise, continuous biometric data around the clock.

Comfortable 24/7 Wear

Crafted with non‑allergenic titanium, the updated design provides improved comfort and durability. Water‑resistant up to 100m/328ft, it’s built to support your day‑to‑day life without distraction.

Extended Battery Life

Enjoy up to 8 days of use on a single charge, with no screens or vibrations—allowing you to stay present while your ring monitors silently in the background.

Health & Wellness Tracking

Sleep

Wake up to detailed sleep analysis, including sleep stages, HRV, nighttime heart rate, and blood oxygen levels—helping you improve habits and transform your rest.

Activity

Track steps, calories burned, workouts and overall movement. Oura helps you balance activity and recovery, whether you’re training or simply staying active.

Readiness

Your Readiness Score combines 30+ body signals—temperature, heart rate, HRV, sleep and more—to help you understand when to push and when to rest.

Stress

Identify signs of stress and learn how your body responds, empowering you to incorporate self‑care and better long‑term recovery.

Illness Detection

Continuous monitoring of temperature trends and heart rate helps you recognise early signs of potential illness.

Women’s Health

Track cycle‑related changes and predict your period up to 30 days in advance, supporting better understanding of daily physical and emotional rhythms.

Heart Health

Monitor daily heart rate and HRV, and gain insights into key indicators of cardiovascular health, including Cardiovascular Age and Cardio Capacity.

Sizing Note – Please Size Before You Buy

Oura Ring sizes differ from standard ring sizes.

Product Specifications

Included Accessories
– Oura Ring
– Charging Dock & USB Cable

Battery
– Capacity: 14.5mAh
– Life: Up to 8 days
– Charging Time: 80 minutes

Sensors & Tracking
– Heart Rate
– Temperature
– Red/Infrared LEDs for blood oxygen
– Green/Infrared LEDs for 24/7 HR & HRV
– Digital temperature sensor
– Accelerometer for activity & movement

Materials & Durability
– Non‑allergenic titanium (inner & outer surfaces)
– Seamless titanium interior
– Water‑resistant to 100m/328ft
– Minor surface scratches are normal with wear

Compatibility
– Oura App available in multiple languages
– Supports metric & imperial units
– Integrates with 40+ apps
– Works with iOS and Android

Connectivity
– Bluetooth Low Energy
– Automatic firmware updates
– EMF‑safe
– Airplane mode supported
– FCC‑certified

Dimensions & Weight
– Width: 7.90mm
– Thickness: 2.88mm (similar to a wedding band)
– Weight: 3.3–5.2g depending on ring size