COLMI R02 Smart Ring Silver (Size 9) — Heart Rate & SpO2 Tracking with Portable Charging Case

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

The COLMI R02 Smart Ring puts wearable monitoring into a slim metal band designed for everyday comfort. Paired with a small charging case, the ring continuously records core health and activity signals and syncs them to your phone, without any monthly app fees. It’s built to be discreet enough for daily wear yet capable of delivering useful trend data for your routines and workouts.

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

The R02 uses optical sensors to capture pulse and SpO2 readings throughout the day; while not a medical device, it provides reliable trend tracking for wellness monitoring. For best results, wear the ring snugly on a stable finger and avoid excessive motion during spot checks.

• 24/7 heart rate sampling with adjustable monitoring intensity modes.
• Blood oxygen measurements available on demand for quick SpO2 checks.
• Nighttime-focused sleep algorithm calibrated to detect sleep stages cleanly.
• Not intended to replace clinical diagnostics—use for lifestyle insights.

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

Battery endurance varies with monitoring frequency: basic tracking offers the longest runtime while continuous heart-rate monitoring shortens it. The included portable charging case refuels the ring on the go and protects it when not worn.

• Basic Mode: 4–5 days (steps and basic sleep tracking).
• Balanced Mode: 3–4 days (hourly heart-rate syncs).
• Enhanced Mode: 2–3 days (real-time heart-rate monitoring).
• Charging case and cable included for convenient portable charging.

How do I choose the right size and wear the ring for best results?

COLMI recommends using the sizing kit or measuring your finger to select the correct ring size before purchase to avoid returns. A proper fit prevents data errors by keeping the sensors aligned with the skin and reducing motion artifacts.

• Use the sizing kit or consult the size chart before ordering.
• The ring should be snug but comfortable on the finger’s base.
• Remove loose-fitting rings to avoid false readings from movement.
• Wear consistently on the same finger for better trend accuracy.

What extra features make the R02 practical for everyday life?

Beyond core biometric tracking, the ring includes convenient tools that make it useful beyond health data. These extras are designed to enhance daily tasks and integrate into social and fitness routines.

• Remote camera control lets you trigger smartphone photos with a gesture.
• Activity tracking filters out stationary hand movements for cleaner step data.
• No app subscription—full features accessible without recurring fees.
• Comes with one ring, charging case, cable, and a user manual for simple setup.

Who this product is for: The COLMI R02 Smart Ring is aimed at people who want a low-profile wearable that captures everyday health and activity trends without ongoing costs. It’s a good fit for commuters, fitness-minded users who prefer minimal hardware, and anyone seeking a compact alternative to wrist wearers. If you value a sleek ring form factor, portable charging, and easy-to-read trend data, the R02 delivers practical features for daily wellness tracking.