COLMI R02 Smart Ring Rose Gold — Compact Health Tracker with 24/7 Heart Rate & SpO2, Portable Charging Case

The COLMI R02 is a discreet rose-gold smart ring that measures heart rate, blood oxygen, and sleep patterns while fitting into a portable charging case—no subscription required.

Designed for people who want continuous health insight without the bulk of a wrist device, the COLMI R02 Smart Ring packs sensors and a compact charger into an elegant metal band. It tracks heart rate around the clock, measures blood oxygen levels, and records nighttime sleep staging, and it delivers those metrics to the companion app with no monthly fees. The ring’s small footprint and neutral rose-gold finish make it suitable for everyday wear and for those who prefer unobtrusive tech.

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

The R02 uses integrated optical sensors to collect pulse and SpO2 data throughout the day and night. While it provides reliable trend information for daily monitoring and lifestyle decisions, it’s intended for wellness tracking rather than clinical diagnosis.

• 24/7 heart rate monitoring with selectable measurement frequency.
• Blood oxygen (SpO2) readings for spot-checks and trend observation.
• Algorithm filters to reduce false readings from hand movements.

What is the battery life and how does the charging case work?

Battery endurance depends on the monitoring mode you choose: Basic mode extends life by limiting recorded metrics, while Enhanced mode uses real-time heart-rate sampling and shortens runtime. The included portable charging case stores extra power and charges the ring on the go, so you can top up without a wall outlet.

• Basic Mode: approximately 4–5 days for step and basic sleep tracking.
• Balanced Mode: about 3–4 days with hourly heart-rate sync.
• Enhanced Mode: roughly 2–3 days with continuous heart-rate monitoring.
• Compact charging case and cable included for convenient recharges.

Which features help with sleep and daily activity insights?

The COLMI R02 focuses its sleep analysis on nighttime rest to minimize daylight interference and provide clearer overnight trends. Daily activity tracking relies on natural arm movement detection and software filters to avoid counting stationary hand motions as steps.

• Night-specific sleep scoring to improve overnight accuracy.
• Continuous trend logging for heart rate, SpO2, and sleep stages.
• Step counting that discriminates true walking from hand gestures.

Do I need a subscription or a sizing kit before buying?

No recurring fees are required to use the COLMI R02; all core functions are accessible without a subscription. To ensure a comfortable fit and avoid returns, COLMI strongly recommends purchasing a sizing kit or using the size chart before selecting your ring size.

• No app subscription or recurring costs for core data access.
• Optional sizing kit recommended for accurate size selection.
• Includes one ring, charging case, charging cable, and manual in the box.

Who is this for: The COLMI R02 smart ring is aimed at adults who want a subtle wearable for everyday wellness tracking—people who prefer a ring to a watch, users who travel and value a portable charging solution, and anyone looking for continuous heart rate, SpO2, and overnight sleep trends without subscription fees. It’s ideal for those focused on lifestyle monitoring and long-term trend awareness rather than clinical diagnostics.