Oura Ring 4 Ceramic, Smart Sensing in Midnight, Size 5 (JZ90-57455-05)

The Oura Ring 4 Ceramic in Midnight, size 5, is a smart ring that tracks sleep, activity, stress, heart health and women's health around the clock. Its high-performance ceramic exterior blends refined elegance with everyday comfort, while the titanium interior stays gentle on sensitive skin. With battery life of up to 8 days on a single charge, it can stay on through workouts, nights out and everyday wear.

Key Features

• Tracks over 50 health metrics with personalised insights into sleep, activity, readiness, stress and heart health
• Smart Sensing adapts to your finger for accurate, continuous readings day and night while optimising battery life
• Up to 8 days of battery life on a single charge, with quick charging while you shower
• Recessed interior sensors and a titanium interior keep the ring comfortable, even on sensitive skin
• Sleep tracking with sleep staging, nap detection and blood oxygen (SpO2) sensing for a fuller picture of rest
• Activity tracking with automatic activity detection, workout heart rate and personalised activity goals
• Stress monitoring with daytime stress and stress resilience insights for longer-term stressors
• Women's health tools including cycle insights, period prediction and temperature trend tracking
• Battery life of 5 to 8 days from a single charge, so you can track your health around the clock
• Comfortable enough for 24/7 wear, from a workout to a night out

About the Oura Ring 4 Ceramic

The Midnight finish is a dark, captivating blue, tinted with a cobalt pigment used in traditional ceramics. The Ceramic Collection is also available in Petal, Tide and Cloud, so each ring can suit a personal style.

Heart health and device compatibility are part of the picture too. The ring measures daily heart rate and heart rate variability (HRV), and helps identify Cardiovascular Age and Cardio Capacity. It works with iOS and Android and integrates with over 40 apps, including Apple Health, Google Health Connect, Natural Cycles, Flo and Strava.

The ring is water resistant and has no screens or vibrations, so it stays out of the way until you need it. A sizing kit is available for purchase, and because Oura Smart Ring sizes differ from standard ring sizes, it is worth sizing yourself before you buy. Sizes range from 4 to 15, and a subscription is required.

Oura Ring 4 Ceramic Specifications

Who It's For

The Oura Ring 4 Ceramic suits anyone who wants a comfortable, discreet smart ring for continuous health tracking, from sleep and recovery to stress and heart health. Its titanium interior and recessed sensors suit sensitive skin, and its battery life means it can stay on day and night. It is a good fit for people who want to follow women's health, cycle patterns and activity goals without a screen on their hand. Buyers who are unsure of their size can use the sizing kit before ordering.

Browse more smart rings at Tech Supply Shed.

1 Year

OURA