COLMI R02 Smart Ring for Men & Women — Black, Pocket Charging Case, 24/7 Heart & SpO2 Tracking

The COLMI R02 is a compact smart ring that monitors heart rate, blood oxygen, sleep and activity while fitting conveniently in a pocketable charging case.

The COLMI R02 smart ring combines discreet wearable design with continuous health and activity tracking without a subscription fee. Designed for people who prefer minimalist wearables, the ring gathers heart rate, blood oxygen (SpO2), sleep patterns and daily activity metrics while allowing remote camera control and sports tracking. It pairs with the companion app to review long-term trends and make adjustments to daily routines, while the included charging case keeps the device ready on the go.

How accurate is the COLMI R02 for everyday heart rate and blood oxygen monitoring?

The R02 uses optical sensors to provide continuous heart rate and blood oxygen estimates suitable for daily wellness awareness and trend spotting. It’s intended for lifestyle tracking rather than medical diagnosis; it highlights deviations and patterns so you can review them in the app or discuss with a professional if needed.

• 24/7 heart rate monitoring with selectable sampling modes.
• Continuous SpO2 tracking to map daily oxygen variation.
• Algorithm filters reduce noise from non-step hand movements.
• Results sync to the app for visual trend review over time.

What battery life can I expect and how does the charging case work?

Battery life depends on monitoring intensity: basic step-and-sleep mode gives the longest runtime, while continuous real-time heart rate sampling shortens it. The compact charging case acts like a portable dock that recharges the ring between uses so you can carry multiple full charges when you’re away from a power source.

• Basic Mode: approx. 4–5 days (steps and basic sleep).
• Balanced Mode: approx. 3–4 days with hourly heart checks.
• Enhanced Mode: approx. 2–3 days with real-time heart monitoring.
• Charging case stores and recharges the ring for travel convenience.

How does the COLMI R02 track sleep and daily activity?

The ring captures nighttime sleep metrics using algorithms tuned for uninterrupted sleep cycles, then summarizes sleep stages and overall rest quality in the app. For daytime activity, the ring detects natural arm swings to count steps and active minutes while filtering out stationary hand gestures to improve accuracy.

• Nighttime sleep monitoring calibrated for continuous sleep patterns.
• Sleep summaries include duration and sleep-stage trends.
• Activity tracking recognizes steps and filters out false positives.
• Sports mode collects exercise-specific metrics for workouts.

What connectivity and convenience features does the ring offer?

The R02 connects to the companion app for data visualization and settings without requiring recurring subscription fees. Convenience functions like remote camera control and simple notifications add smart functionality to the ring’s minimalist design, making everyday tasks easier without pulling out your phone.

• No app subscription — full features available after pairing.
• Remote camera shutter control for selfies and group photos.
• Activity and sleep summaries sync automatically to the app.
• Portable charging case for easy top-ups while traveling.

Who is this for? The COLMI R02 is built for people who want a low-profile wearable that monitors wellness and activity without a bulky wristband or recurring subscription. It suits commuters, fitness-minded users who prefer subtle styling, and anyone seeking continuous trend tracking for heart rate, SpO2 and sleep in a compact, easy-to-charge package. Before buying, COLMI recommends using a sizing kit or consulting the size chart to ensure a comfortable fit and avoid exchanges.

Note: The COLMI R02 provides lifestyle and wellness data. It is not a medical device and should not replace professional medical advice.