Colmi R02 Smart Ring, Size 12, 21.3 mm, Black with Charging Case

The COLMI R02 Smart Ring, size 12 (21.3 mm), is a lightweight and discreet wearable device in black that integrates advanced health monitoring with comprehensive sports tracking. It continuously measures heart rate and blood oxygen levels (SpO2), analyzes sleep patterns, and monitors daily activity across 21 dedicated sports modes. Equipped with Bluetooth 5.0, it seamlessly syncs with the QRing app to store and analyze your data. With an IP68 water-resistance rating and an included charging case, this smart ring offers reliable performance for up to 6–7 days on a single charge.

Advantages

The COLMI R02 is engineered for maximum comfort, weighing only 4.7 g with a slim 2.7 mm profile, making it virtually unnoticeable during daily activities. Its titanium alloy exterior provides excellent durability against scratches, while the hypoallergenic resin inner lining ensures skin-friendly wear for extended periods. Because it does not restrict hand movement, it is ideal for continuous 24/7 monitoring, capturing data even during sleep or tasks where a traditional smartwatch might be cumbersome. The automatic background tracking of vital signs and sleep stages provides a comprehensive overview of your recovery and health without requiring manual input.

Suitable for

• Continuous health monitoring including heart rate and blood oxygen levels
• Tracking daily physical activity and workout metrics
• Detailed sleep quality and recovery analysis
• Users who prefer a discreet alternative to smartwatches
• Active individuals needing water-resistant wearable technology

When it may not be suitable

This device may not be suitable for users requiring medical-grade diagnostic equipment, as it is intended for general wellness and fitness tracking rather than clinical health monitoring. Additionally, individuals with very specific finger sizes outside the provided range or those who prefer a screen-based interface for real-time notifications may find a traditional smartwatch more appropriate for their needs.

Key specifications

• Inner diameter: 21.3 mm (Size 12)
• Material: Titanium alloy casing with hypoallergenic resin lining
• Connectivity: Bluetooth 5.0
• Battery life: 6–7 days
• Water resistance: IP68
• Compatibility: Android 4.4+, iOS 8.0+, Harmony OS
• Sports modes: 21

How to use

To begin, ensure the ring is fully charged using the provided magnetic charging case. Download and install the QRing app on your smartphone, then pair the device via Bluetooth. Once connected, the ring will automatically begin tracking your heart rate, blood oxygen, and activity levels. For accurate measurements, ensure the ring fits snugly on your finger. You can view your daily statistics, sleep analysis, and workout history by syncing the ring with the app at your convenience. The ring stores data locally, so you do not need to keep your phone nearby during exercise or sleep.

What to consider before purchase

• Measure your finger circumference accurately using a string or thread before selecting your size.
• Take measurements in the evening when fingers are naturally slightly larger.
• Ensure your smartphone operating system meets the minimum requirements for the QRing app.
• Consider that the ring is designed for fitness and wellness tracking, not as a medical device.

Usage recommendations

For the most accurate health data, wear the ring consistently throughout the day and night. Clean the inner surface periodically with a soft, dry cloth to maintain sensor performance and skin comfort. Always use the provided charging case to protect the device and ensure it remains powered for your daily activities.