Smart ring Colmi R03 — size 9 (18.9 mm inner diameter), gold finish

Colmi R03 smart ring in gold (size 9, inner diameter 18.9 mm) combines a lightweight titanium alloy design with daily health and activity monitoring. The ring pairs with the QRing app (Android, iOS, HarmonyOS) via Bluetooth 5.0 to display sleep, heart rate, SpO2 and activity data. It is water resistant to 5 ATM and comes with a magnetic-charging case and USB-C cable for convenient storage and recharging. The ring’s battery provides about 3–5 days of use; the charging case has a 200 mAh battery and can recharge the ring multiple times.

Advantages

The Colmi R03 offers continuous health monitoring with 24-hour heart rate tracking, sleep phase and quality analysis, and blood oxygen measurement. Sports and activity features include step counting, calorie and distance tracking, and 21 selectable sports modes. The device is lightweight (4.7 g), made of titanium alloy for corrosion resistance, and rated 5ATM for water resistance, allowing use during exercise and swimming. The included charging case extends operating time and stores the ring safely.

Key specifications

• Manufacturer: Colmi
• Model: R03
• Color: Gold
• Size / Inner diameter: 9 / 18.9 mm
• Material: Titanium alloy
• Weight: 4.7 g
• Main chipset: BlueX Micro RF03
• Memory: ROM 512 KB
• Heart rate sensor: Vcare VC30F
• Accelerometer: STK8321
• Bluetooth: 5.0
• Ring battery: Lithium-polymer, 15 mAh, magnetic charging, ~3–5 days runtime, charging time ~1 h, >300 cycles
• Charging case battery: Lithium-polymer, 200 mAh, USB-C charging, ~1 h charging time, ~300 cycles
• Charging case dimensions: 43 x 43 x 25 mm
• Compatibility: Android 4.4+; iOS 8.0+; HarmonyOS
• App: QRing (generates daily, weekly, monthly reports)
• Water resistance: 5ATM
• Updates: OTA
• Available app features: step counter, calorie counter, distance measurement, heart rate, sleep monitoring, 21 sports modes, exercise log, blood pressure, SpO2, stress level, remote photo

How to use

Install the QRing app on a compatible smartphone, enable Bluetooth, and pair the Colmi R03. Wear the ring on the finger that provides the most comfortable fit and ensure good contact with the skin for accurate measurements. Use the app to view real-time data, set exercise modes, and review daily, weekly and monthly reports. Place the ring into the magnetic charging case to recharge; the case itself charges via the included USB-C cable.

Recommendations

For best results, keep the ring and sensor area clean, wear the ring continuously for reliable sleep and heart rate tracking, and charge the case regularly so it can supply multiple recharges to the ring. Consult the app’s supported languages and settings to personalize alerts and measurement intervals.