COLMI R02 Smart Ring Health Tracker Gold (Size 8) — Heart Rate & SpO2 Monitoring with Charging Case

The COLMI R02 is a compact smart ring that tracks heart rate, blood oxygen, sleep patterns and daily activity, and comes with a portable charging case—no subscription required.

The COLMI R02 smart ring blends jewelry-like styling with wearable health and activity tracking. Designed for both men and women, the R02 delivers continuous heart-rate monitoring, nocturnal sleep analysis and blood-oxygen readings inside a low-profile metal band. It syncs data to your phone without monthly fees and includes a small charging case to keep the ring powered on the go.

How accurate is the COLMI R02 for heart rate and blood-oxygen readings?

The ring uses compact optical sensors to capture pulse and SpO2 trends throughout the day and night. While it provides helpful trend data and alerts to changes, it should not replace professional medical devices. Data quality improves when the ring fits snugly and is worn consistently.

• 24/7 heart-rate monitoring with selectable frequency modes.
• Blood-oxygen (SpO2) spot checks and trend logging.
• Best results obtained when ring size matches the finger closely.
• Nighttime algorithms tuned for cleaner sleep-cycle readings.

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

Battery length varies by monitoring intensity. In Basic Mode (limited sensors) you can expect around 4–5 days, while real-time monitoring reduces runtime to 2–3 days. The included pocket-sized charging case stores and recharges the ring so you can charge between outings without carrying cords.

• Basic Mode: ~4–5 days (steps and basic sleep).
• Balanced Mode: ~3–4 days with hourly heart-rate syncs.
• Enhanced Mode: ~2–3 days with continuous heart-rate monitoring.
• Charging case for convenient on-the-go recharges and storage.

Which features help with everyday use and convenience?

Beyond health metrics, the R02 offers practical utilities for daily life. Photo control lets you use the ring as a remote shutter for your phone, and automatic activity recording captures steps while filtering out hand-only movements for cleaner step totals.

• Remote camera control for selfies and group shots.
• Activity tracking that filters stationary hand motions.
• Sleek gold finish that works as everyday jewelry.
• No subscription fees—basic app features are included free.

Who is this ring for? The COLMI R02 suits anyone seeking a discreet wearable that combines simple health trend tracking with jewelry-style aesthetics—ideal for active people who want hands-free convenience, travelers who value a portable charging case, and users who prefer devices without ongoing subscription costs. Remember to order a sizing kit or measure carefully for the best fit, as accurate sensor readings depend on correct ring size. For support or setup questions, COLMI provides after-sales help and a full accessory set including the ring, charging case, cable and manual.