COLMI R02 Smart Ring, size 9, 18.9 mm (black) + charging case

COLMI R02 Smart Ring, Size 9

The black COLMI R02 Smart Ring in size 9 (18.9 mm inner diameter) is a lightweight, discreet wearable that combines health monitoring with sports tracking. It measures heart rate and blood oxygen saturation (SpO2), analyses sleep, and tracks daily activity and workouts across 21 sports modes. Bluetooth 5.0 connects the ring to the QRing app, while onboard storage retains data for later synchronisation. IP68 water resistance and the included charging case support convenient everyday use, with a battery life of 6–7 days per charge.

Compact Design and Comfort

Designed for comfortable daily wear, the ring weighs approximately 4.7 g and is 2.7 mm thick. Its lightweight design does not restrict hand movements during writing, physical work or exercise, making it suitable for continuous wear day and night and ongoing data collection.

Health and Vital Sign Monitoring

The COLMI R02 monitors heart rate and blood oxygen saturation (SpO2) automatically in the background. Measurements can help you observe changes associated with activity, stress and rest. Data is stored in the ring, so it can be synchronised with the app later, even when your phone is not with you. The app presents the results for review over time.

Sleep and Recovery Analysis

Automatic overnight sleep tracking records total rest time and identifies sleep stages, including light and deep sleep. The data can be synchronised with the app in the morning, allowing you to review sleep duration and patterns without needing a constant phone connection.

Sports Modes and Activity Tracking

The ring offers 21 sports modes for activities including walking, running and general training. It tracks steps, distance, calories burned, workout duration and heart rate, helping you review activity and monitor progress over time.

Connectivity and Compatibility

Bluetooth 5.0 provides wireless communication with the QRing app, where synchronised data is presented for review. The ring is compatible with Android 4.4 and later, iOS 8.0 and later, and HarmonyOS.

Charging Case and Battery Life

The included case provides storage and charging. Place the ring in its designated position to charge it through magnetic contacts. Battery life is approximately 6–7 days, and a full charge takes about one hour.

Materials and Water Resistance

The outer casing is made of titanium alloy for resistance to everyday wear and scratches. A hypoallergenic resin inner lining is designed to improve wearing comfort. IP68 water resistance supports use while washing hands, exercising and bathing.

Choosing the Right Size

Choosing the correct size is important for comfort and measurement accuracy. Measure around your finger with a thin string or thread, mark where the ends meet, and compare the length with the size chart. Available sizes are 8 (18.1 mm), 9 (18.9 mm), 10 (19.8 mm) and 11 (20.6 mm). Measuring in the evening may provide a more representative fit, as fingers can be slightly larger than in the morning.

Included

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

Specifications

• Manufacturer: COLMI
• Model: R02
• Size: 9
• Inner diameter: 18.9 mm
• Circumference: 59.5 mm
• Colour: Black
• Outer material: Titanium alloy
• Inner material: Hypoallergenic resin
• Thickness: 2.7 mm
• Weight: Approximately 4.7 g
• Health and monitoring features: Heart rate measurement, blood oxygen saturation (SpO2) measurement, sleep monitoring, activity monitoring and activity-level monitoring
• Sports modes: 21
• Recorded data: Activity time, distance, calories and heart rate
• Connectivity: Bluetooth 5.0
• App: QRing
• System compatibility: Android 4.4 and later, iOS 8.0 and later, HarmonyOS
• Charging case: Yes; charging and storage
• Water resistance: IP68