COLMI R02 smart ring, size 12

The COLMI R02 smart ring in size 12 (21.3 mm) in black is a lightweight and discreet smart ring that combines health monitoring with sports functions. The device measures heart rate and blood oxygen level (SpO2), analyzes sleep, and tracks daily activities and workouts in 21 sports modes. Thanks to Bluetooth 5.0, it works with the QRing application, stores data for later synchronization, and IP68 water resistance and the included charging case ensure convenient use for up to 6-7 days on a single charge.

Compact design and comfort

The ring is designed for maximum comfort during everyday use. Weighing only 4.7 g and measuring just 2.7 mm thick, you will quickly stop noticing it. It does not restrict hand movement and does not interfere with writing, physical work or exercise. This means that you can wear it continuously day and night without having to take it off. This allows for continuous data collection, even in moments that larger devices often miss.

Monitoring health and vital signs

COLMI R02 continuously monitors key vital signs such as heart rate and blood oxygen saturation (SpO2). Measurements are performed automatically in the background, meaning you don't have to manually activate each function. This makes it easy to observe changes in your body based on activity, stress, or rest. The data is stored in the device's memory, so even if you don't have your phone with you, nothing will be lost. After synchronizing with the app, you can analyze the results in a broader context and observe long-term changes.

Sleep and recovery analysis

One of the ring's most powerful features is its sleep tracking, which starts automatically every night. The device recognizes sleep stages, such as light and deep sleep, and records your total rest time. This allows you to check not only how much sleep you're getting, but also how effectively your body is recovering. The data is stored locally and synced to the app in the morning, providing a complete picture of your sleep without the need for a constant connection. This feature will be especially appreciated by those who don't like to wear a watch to bed.

Sports modes and activity

The ring offers 21 sports modes that cover the most popular forms of exercise. Whether you choose to walk, run, or do general exercise, the device tracks key activity metrics. This includes steps taken, distance covered, calories burned, and exercise duration. This gives you better control over your workout intensity and allows you to gradually increase your activity level. Regular data tracking also makes it easier to track your progress and stay motivated.

Connectivity and compatibility

Communication is handled by Bluetooth 5.0, which ensures a stable connection and low power consumption. When the ring is paired with the QRing app, all data is sent to one place, where it is presented in an easy-to-read format. Synchronization is fast and does not require complicated setup. The ring is compatible with Android 4.4 and higher, iOS 8.0 and higher, and Harmony OS, allowing easy connection with older and newer smartphones.

Charging case and battery life

The included case serves as a practical docking station, making it easy to store and charge the ring. Simply place it in the designated place to start charging via magnetic contacts. The ring itself offers a battery life of 6-7 days, allowing you to use it without frequently reaching for the charger. A full charge takes about an hour, so a short break is enough to restore full functionality. This solution works well for everyday use, where simplicity and speed of operation are important.

Durability and materials

The titanium alloy housing increases resistance to scratches and everyday wear. As a result, the ring better withstands contact with hard surfaces and retains its aesthetic appearance for longer. The hypoallergenic resin inner lining improves wearing comfort and reduces the risk of irritation. This is especially important for a device that is worn for several hours a day. IP68 water resistance allows you to use the ring while washing hands, exercising or coming into contact with water without having to take it off.

How to choose the right size

Choosing the right size is crucial for comfort and accuracy. To do this, wrap a thin string or thread around your finger, mark where it meets, and measure the length. Compare the result with the size chart. The model is available in sizes 8 (18.1 mm), 9 (18.9 mm), 10 (19.8 mm), 11 (20.6 mm), and 12 (21.3 mm), allowing it to fit a variety of users. For greater accuracy, it is best to measure in the evening, when your fingers are naturally slightly larger than in the morning.

Included

• COLMI R02 ring
• Charging case
• Magnetic cable
• User manual

Same summary

The COLMI R02 smart ring, size 12 (21.3 mm), is designed for users who want to discreetly monitor their health and activity without having to wear a watch or a larger smart device. It stands out in its functionality for measuring sleep, heart rate and counting steps, while allowing freedom of movement and comfort even during sports activities. The compromise compared to larger wearable devices is usually a smaller set of advanced functions and shorter autonomy during intensive use. Before choosing, it is advisable to check the compatibility with your mobile phone and choose the correct size for the most reliable measurements.

Recommendation source: Enaa guides and team experiences.

User view

Typical users of this smart ring are individuals who rely on minimalist and comfortable wearable accessories in their everyday lives. The ring is particularly convenient for those who want continuous monitoring of activity, sleep or well-being, but at the same time do not like the feel of a watch on the wrist. In practice, it is also appreciated by people who are constantly on the move and want to quickly check key health data.

Users often trust the Colmi brand for its affordability, modern design, and user-friendly ecosystem that allows for easy connectivity with phones.

Why buy at Enaa

At Enaa, you always receive up-to-date product information and realistic descriptions to help you choose a smart ring based on your real needs. With the offer in the smart ring category, we provide a quick overview of different models and sizes so you can find the solution that best suits your lifestyle.

Answers to frequently asked questions

Is the ring suitable for use during sports and heavy sweating?

The ring is designed to be worn daily, even during sports activities, but it is recommended to check the water resistance level according to your activities. If you are frequently exposed to water or sweat a lot, choose a model with the appropriate resistance.

What should I check for compatibility with my phone?

Make sure your phone is compatible with the COLMI R02 ring app. Most often, support is provided for Android and iOS, but check that your operating system version meets the manufacturer's requirements.

How do I choose the right smart ring size?

The correct size is key to comfort and accuracy of measurements. It is best to measure yourself before purchasing according to the manufacturer's instructions or use the size charts on the product's official website.

How easy is it to charge a smart ring?

The COLMI R02 smart ring is charged with the included charging case, which allows for convenient and quick charging even on the go. Regular charging contributes to a better user experience.

Does the data sync with fitness or wellness apps?

Most smart rings in this category allow basic data synchronization with selected fitness or wellness apps. Check in the app beforehand which third-party platforms are supported for your model.

Description updated: May 2026