Oura Ring 4 Ceramic Size 9 Midnight
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Product number | 979885 | |
|---|---|---|
Manufacturer code | JZ90-57455-09 | |
Brand | Oura | |
Processing of your defect | Carry-in warranty |
Operating system | Brand-specific | |
|---|---|---|
Compatible with operating system | Android, iOS | |
Required iPhone model | No impact | |
Required Android version smartphone | Android 13.0 or higher | |
Year introduced | 2024 | |
Guaranteed support with updates | Unknown |
Type of health tracker | Smart ring | |
|---|---|---|
Weight | 0,18 g | |
Shockproof | ||
Collection color | Blue | |
Width | 11,3 mm | |
Depth | 3,5 mm | |
Height | 11,3 mm | |
Ring size | 9 |
Battery/battery capacity | 0,0255 Ah | |
|---|---|---|
Energy source solar power | ||
Battery life in time mode | 192 hours | |
Battery life in sports mode | 5 days | |
Quick charge functionality |
Bluetooth | ||
|---|---|---|
ANT+ |
Built-in GPS receiver |
|---|
Altimeter | ||
|---|---|---|
Barometer | ||
Thermometer | ||
Gyroscope | ||
Depth gauge |
Calorie counter | ||
|---|---|---|
Pedometer | ||
Measures distance | ||
Measures stairs climbed | ||
Speedometer |
Heart rate measurement | ||
|---|---|---|
Heart rate measurement under water | ||
Type of heart rate measurement | Optical heart rate measurement | |
Heart rate zones | ||
Measure fitness age | ||
VO2 max measurement | ||
Average heart rate during sleep | ||
Oximeter | ||
EDA sensor | ||
Pregnancy monitoring | ||
Menstrual cycle tracking | ||
Skin temperature sensor | ||
Blood pressure monitor | ||
Sleep score | ||
Measure recovery during sleep | ||
Meet HRV |
Manual training programs | ||
|---|---|---|
Recovery advice | ||
ATM score | 10 |
Fall detection |
|---|
Suitable for model | Oura Ring 4 | |
|---|---|---|
Included accessories | No accessories | |
Generation | Adults | |
Gender adults | Unisex | |
Wireless charging | ||
Type of USB port | USB-C |
Quality of health readings | Very good | |
|---|---|---|
Quality of sports readings | Good |
Compatible with operating system | Android, iOS | |
|---|---|---|
Type of health tracker | Smart ring | |
Ring size | 9 | |
Quality of health readings | Very good |
According to our health tracker expert
You gain a lot of insight into your health and tips to improve your lifestyle.
This ring is sturdy and stylish thanks to the titanium inside and the ceramic finish.
The ring lasts 5 to 8 days on a full charge, so you don't have to charge it often.
You need an Oura subscription if you want to use all functions.
First order a sizing kit before you order an Oura Ring 4. That way, you buy the right size right away. An Oura Ring size is different from your regular ring size. You'll receive the € 10 purchase price as CoolblueCredit. You can use this credit when you buy an Oura Ring 4 at Coolblue.
Learn all about your health and measure your daily activity with the Oura Ring 4 Ceramic Size 9 Midnight. With this smart ring, you gain insight into your sleep, your heart condition, and your stress level. You can also keep track of all your workouts and gain insight into your menstrual cycle. The ring is made of sturdy titanium with a zirconium ceramic finish. This means it's stylish and can take a hit. You also receive tips based on your data. A breathing exercise when your stress levels are high, for example. The Oura Ring 4 is sweat-proof and water-resistant. This means you can keep it on while exercising and when you're in the shower. With a full battery, this smart ring lasts 5 to 8 days.
Note: you need a subscription if you want access to all functions of the Oura Ring 4. You can take out this monthly or yearly subscription in the Oura app during the installation. You need a credit card for this.
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It is a good idea to purchase a sizing kit before ordering the Oura ring, so you can properly test the size first (wear it for at least 24 hours). I initially thought I needed a specific size, but apparently my fingers swell up a lot at night. Without the sizing kit, that size would have been a major mispurchase.
The ring is very pleasant to use. The app provides very clear insight into my day. Because I have energy issues due to Long Covid, this overview helps me enormously to determine when I need to rest. The ring tracks your sleep, restedness, heart rate, steps, calorie burn, activities, breathing, and much more! Additionally, it can also be used underwater, I believe up to 100 meters.
Mostapha
22 May 2026
Automatically translated from Nederlands
I used to have an Apple Watch, but this OURA ring 4 is much more feature-rich and wears fantastically!
Caroline
7 June 2026
Automatically translated from Nederlands