Smart ring Colmi R03 19.8 mm Gold — Colmi R03 Gold 10 size 19.8 mm

Colmi R03 is a smart ring in a gold finish with an inner diameter of 19.8 mm (size 10). It provides compact access to health and activity data via the QRing app and is designed for daily wear thanks to a lightweight titanium alloy construction, 5ATM water resistance and a charging case that stores and recharges the ring.

Advantages

The Colmi R03 offers continuous heart rate and blood oxygen monitoring, sleep tracking with phase analysis, and activity tracking including steps, distance and calories. The ring supports 21 sports modes, connects via Bluetooth 5.0, and works with Android, iOS and Harmony OS. Its built-in 18 mAh battery runs about 5–7 days per charge and the included 200 mAh charging case can recharge the ring multiple times. Materials and construction resist corrosion and wear, while the magnetic charging and USB-C case provide convenient recharging.

Suitable for

• Everyday wear and discreet notifications
• Sleep monitoring and sleep quality analysis
• Light to moderate fitness tracking (walking, running, swimming)
• Users who prefer compact, minimal wearable devices

Key specifications

• Manufacturer: Colmi
• Model: R03
• Color: Gold
• Size / Inner diameter: 19.8 mm (size 10)
• Material: Titanium alloy
• Weight: 4.7 g
• Main chipset: BlueX Micro RF03
• Memory: ROM 512 KB
• HR sensor: Vcare VC30F
• Accelerometer: STK8321
• Bluetooth: 5.0
• Ring battery: Lithium‑polymer 18 mAh, magnetic charging, ~1 h charge time, 5–7 days operating time
• Charging case battery: Lithium‑polymer 200 mAh, USB‑C charging, ~1 h charge time, charges the ring up to 13 times on a single case charge
• Number of charging cycles (ring/case): over 300 / ~300
• Water resistance: 5ATM
• App: QRing (Android 4.4+/iOS 8.0+/Harmony OS)
• Available functions in app: step counter, calorie counter, distance measurement, heart rate, sleep monitoring, 21 sports modes, exercise log, blood pressure, blood oxygen (SpO2), stress level, remote photo
• Updates: OTA

How to use

Charge the case via the USB‑C cable, then place the Colmi R03 in the magnetic slot of the case to charge the ring. Install the QRing app on a compatible smartphone (Android 4.4 or later, iOS 8.0 or later, or Harmony OS), pair the ring via Bluetooth 5.0 and follow the in‑app setup to allow health and activity permissions. Wear the ring on a comfortable finger; the inner diameter is 19.8 mm. Use the app to view daily, weekly and monthly reports, enable sports modes before exercise, and check heart rate, SpO2 and sleep data.

Recommendations

For best results, wear the ring snugly but comfortably on the same finger during sleep and workouts, keep the QRing app updated, charge the ring regularly using the supplied magnetic charging case, and rinse and dry the ring after exposure to water or sweat to maintain the titanium alloy finish.