COLMI R02 smart ring, size 9

The COLMI R02 smart ring in size 9 (18.9 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 inner lining made of hypoallergenic resin 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 swimming 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), and 11 (20.6 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 9 (18.9 mm), is a discreet choice for users who want to unobtrusively track their daily activities, health and sleep – without wrist devices. Due to the emphasis on basic functions, it is most useful as a companion for recording steps, heart rate and night monitoring. Choosing the right size is key to comfort and accuracy of measurements; users who do not follow the size chart may encounter deviations in measurements. The ring is especially suitable for those who appreciate minimalism and want a technological accessory that blends with everyday style with minimal maintenance.

Recommendation source: Enaa guides and team experiences.

User view

The typical user of the COLMI R02 smart ring is an active individual who prioritizes simplicity, low visibility of wearable devices and basic health monitoring functions. The ring is practical for everyday wear, even during sleep or sports, as it does not hinder movement and is not noticeable like a classic smartwatch or bracelet. Due to its lightweight design and easy synchronization with a mobile phone, it is also often chosen by those who want a more minimalist approach to smart electronics.

Users also often appreciate the technological focus of the Colmi brand, as it offers a comprehensive ecosystem of devices for various needs and enables easy connectivity and data transparency in one place.

Why buy at Enaa

At Enaa, you can choose from a reliable range of smart rings, where model details are clearly presented and tailored to your needs. In addition, our team regularly updates the information so that you can count on relevant data and modern trends from the world of smart devices with every purchase.

Answers to frequently asked questions

Is the COLMI R02 ring suitable for everyday wear, even while sleeping?

Yes, the smart ring's design allows for comfortable wear 24/7, including at night, which is especially useful for monitoring sleep and well-being throughout the day.

What should I consider when choosing a smart ring size?

It is important to accurately measure your finger and compare the data with the manufacturer's size chart, as only the correct size ensures comfort and reliability of measurements.

Does the COLMI R02 ring support connection with all smartphones?

The ring is compatible with most Android and iOS phones, but it is recommended to check the app requirements and operating system version your phone supports before purchasing.

How is the smart ring charged and how long does the battery last?

The ring is charged with the included charging case, allowing for convenient energy supply even on the go. Autonomy depends on the method of use, but is usually sufficient for several days of activity tracking.

Is the ring water and sweat resistant for use during sports?

The ring is designed for basic protection against sweat and moisture, but is not intended for swimming or prolonged contact with water. It is recommended to dry the ring after exercise or contact with water for optimal performance.

Description updated: May 2026