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A real review to help you decide which smart ring offers the best value and features compared.
Every detail counts. The COLMI R02 has 145 specs to explore — from must-have certification rating, charging method, bluetooth version & heart rate sensor to nice-to-haves.
A fast snapshot of the COLMI R02, covering its standout specification and what you can expect right out of the box.
COLMI R02
The COLMI R02 Smart Ring delivers essential fitness and health tracking features in a compact and affordable design. It monitors heart rate, sleep quality, and daily activity while supporting multiple sports modes. With a lightweight build and efficient battery life, it is ideal for everyday use.
Quick Specs Breakdown
The key specs that actually matter—no fluff, no guesswork
Here’s a streamlined view of the COLMI R02 key specifications. Compare critical features at a glance before exploring the full specs and hands-on insights below.
Design & Build
Certification Rating
What certification rating does it have?
IP68, 5ATM
Battery & Charging
Charging Method
How does it charge?
Magnetic Dock
Battery Life
How long does the battery last?
5–6 Days
Connectivity & Performance
Bluetooth Version
What Bluetooth version does it use?
5.0
Hardware & Sensors
Heart Rate Sensor
Does it have a heart rate sensor?
Yes
Blood Oxygen Sensor
Does it have a blood oxygen sensor?
Yes
Sleep Tracking Sensor
Does it include sleep tracking hardware?
Yes
Health & Fitness Tracking
Workout Tracking
Does it support workout tracking?
Yes
Heart Rate Monitoring
Does it support heart rate monitoring?
Yes
Blood Oxygen Monitoring
Does it support blood oxygen monitoring?
Yes
General Information
Operating System Support
Which operating systems are supported?
iOS, Android
Generation
What generation is the device?
2
Water Usage Rating
What is the water usage rating?
5ATM
Wearable Category
What wearable category does it belong to?
Health Tracking,Fitness Tracking
Safety & Compliance
CE Certified
Is it CE certified?
Yes
Specifications & Facts
145
Specs measured. Drama avoided.
Get more than a spec sheet. We broke down the COLMI R02 into what users actually care about — feel, function, and what’s worth it.
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The device boasts an IP68 rating and 5ATM water resistance, meaning it is dust-tight and can safely withstand water pressures equivalent to immersion up to 50 meters underwater, making it suitable for swimming and water-related activities.
Official ingress or water resistance certification.
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Interchangeable Shell
Does it have an interchangeable shell?
Yes
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The ring features an interchangeable shell to allow users aesthetic customization or easy replacement of the outer casing.
Indicates if outer shell or cover can be replaced.
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COLMI R02
Finish Type
What type of finish does it have?
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Polished
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The finish type is polished, giving the ring a shiny, smooth surface that enhances its aesthetic appeal.
Describes the surface texture and visual finish.
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COLMI R02
Ring Width
What is the ring width?
0.31
inch
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The ring width measures 0.31 inch, equivalent to 0.79 cm, contributing to its sleek and comfortable profile.
Measures the band width across the finger.
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Ring Thickness
How thick is the ring?
0.11
inch
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The ring thickness is 0.11 inch, approximately 0.28 cm, contributing to its slim profile for user comfort.
Indicates the vertical thickness of the ring.
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COLMI R02
Hypoallergenic
Is it hypoallergenic?
Yes
0Votes
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The ring is hypoallergenic, making it suitable for users with sensitive skin or allergies to certain metals or materials.
Indicates skin-friendly materials suitable for sensitive users.
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Waterproof
Is it waterproof?
Yes
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The ring is waterproof, ensuring protection against water damage during daily activities and occasional submersion.
Indicates whether the ring is fully waterproof.
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COLMI R02
Water Resistance Depth
What is the water resistance depth?
164
ft
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Water resistance depth is 164 feet, which equals 50 meters, confirming the device is safe for submersion during swimming.
Maximum supported water depth rating.
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Dust Resistant
Is it dust resistant?
Yes
0Votes
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The ring has dust resistant properties, protecting its internal components from contamination by small particles.
Indicates protection against dust ingress.
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Ring Material
What material is the ring made from?
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Stainless Steel
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Defines the primary structural material of the ring.
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Coating Type
What coating type does it use?
0
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0
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None
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Indicates protective or aesthetic surface coating.
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Color Options
What color options are available?
0
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0
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Rose gold, Black, Silver
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Lists available color variants.
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Ring Shape
What is the ring shape?
0
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Round
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Describes the exterior shape profile.
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Weight
How much does it weigh?
0.15
oz
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Total weight of the smart ring.
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Scratch Resistant
Is it scratch resistant?
Yes
0Votes
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Specifies resistance to surface scratches.
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Size & Fit
10
COLMI R02
Fit Guidance
Is fit guidance provided?
Yes
0Votes
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Fit guidance is available to assist users in selecting the correct ring size or adjusting for comfort during wear.
Indicates if sizing instructions are provided.
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Unisex Design
Is it a unisex design?
Yes
0Votes
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The design is unisex, meaning it is aesthetically and functionally appropriate for users of any gender.
Indicates suitability for all genders.
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Daily Wear Suitable
Is it suitable for daily wear?
Yes
0Votes
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The ring is suitable for daily wear; this implies it is comfortable and durable enough to be worn throughout the day without causing irritation.
Indicates suitability for continuous daily use.
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Comfort Fit Interior
Does it have a comfort-fit interior?
Yes
0Votes
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The interior of the ring is designed for comfort, reducing irritation and allowing for longer continuous wear.
Indicates ergonomic interior shaping for comfort.
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Available Sizes
What sizes are available?
0
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US 7, US 8, US 9, US 10, US 11, US 12
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Lists the selectable ring sizes offered.
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Size System
What sizing system does it use?
0
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US
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Indicates the sizing standard used.
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Adjustable Fit
Is the fit adjustable?
No
0Votes
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Specifies whether the ring size can be adjusted.
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Sizing Kit
Is a sizing kit included?
No
0Votes
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Indicates whether a physical sizing kit is included or provided.
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Custom Fit Option
Is custom fit available?
No
0Votes
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Specifies if custom sizing is available.
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Sleep Wear Suitable
Is it suitable for sleep wear?
Yes
0Votes
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Indicates comfort for overnight use.
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Workout tracking is supported, enabling the device to monitor and record physical exercise activities automatically or manually according to user preference.
Supports manual workout mode logging.
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Enables SpO2 tracking functionality.
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Sleep Tracking
Does it track sleep?
Yes
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Sleep tracking is enabled, allowing automatic monitoring of sleep duration and quality through sensors.
Tracks total sleep duration.
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Resting Heart Rate
Does it track resting heart rate?
Yes
0Votes
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Resting heart rate monitoring allows for tracking heart rate when the user is inactive, useful for assessing cardiovascular fitness.
Tracks resting heart rate trends.
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Step Tracking
Does it track steps?
Yes
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Step tracking is enabled, which supports fitness monitoring by counting users' steps throughout the day.
Counts daily step totals.
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Sleep Stages Tracking
Does it track sleep stages?
Yes
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Sleep stages tracking is available, offering granularity in sleep analysis including light, deep, and REM phases.
Tracks light, deep, and REM sleep stages.
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Sleep Score
Does it provide a sleep score?
Yes
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Sleep score functionality is included, allowing the device to provide users with a quantitative measure of their sleep quality and patterns.
Provides an overall sleep quality score.
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Heart Rate Variability
Does it measure heart rate variability?
No
0Votes
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Measures HRV for recovery and stress insights.
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Skin Temperature Monitoring
Does it monitor skin temperature?
No
0Votes
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Tracks variations in skin temperature.
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Calorie Tracking
Does it track calories?
Yes
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Calculates estimated calories burned.
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Distance Tracking
Does it track distance?
Yes
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Estimates distance traveled.
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Automatic Workout Detection
Does it automatically detect workouts?
No
0Votes
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Automatically detects exercise sessions.
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Stress Monitoring
Does it monitor stress?
No
0Votes
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Measures stress levels using biometric signals.
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Recovery Tracking
Does it track recovery?
No
0Votes
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Provides recovery or readiness insights.
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Women Health Tracking
Does it support women's health tracking?
No
0Votes
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Supports menstrual cycle or hormonal tracking.
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Meditation Support
Does it support meditation tracking?
No
0Votes
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Offers guided or tracked meditation features.
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Hydration Tracking
Does it support hydration tracking?
No
0Votes
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Tracks or estimates hydration levels.
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Respiratory Rate Tracking
Does it track respiratory rate?
No
0Votes
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Tracks breathing rate metrics.
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Readiness Score
Does it provide a readiness score?
No
0Votes
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Provides daily readiness or performance score.
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Smart Features
15
COLMI R02
Data Sync Method
How does it sync data?
0
COLMI R02
0
Votes
Manual Sync
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Data synchronization occurs through manual sync, meaning the user must initiate data transfer to refresh information between the ring and its companion device or app.
Defines how data synchronization occurs.
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Remote Camera Control
Does it support remote camera control?
Yes
0Votes
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Allows remote smartphone camera triggering.
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Call Notifications
Does it support call notifications?
No
0Votes
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Supports incoming call alerts.
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Message Notifications
Does it support message notifications?
No
0Votes
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Supports SMS or messaging alerts.
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App Notifications
Does it support app notifications?
No
0Votes
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Supports third-party app alerts.
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Alarm Function
Does it have an alarm function?
No
0Votes
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Includes vibration-based alarm capability.
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Vibration Alerts
Does it provide vibration alerts?
No
0Votes
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Provides haptic feedback alerts.
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Gesture Control
Does it support gesture control?
No
0Votes
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Supports motion-based command inputs.
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Voice Assistant
Does it support voice assistants?
No
0Votes
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Integrates with digital voice assistants.
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Contactless Payment
Does it support contactless payments?
No
0Votes
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Enables NFC-based payments.
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Find My Device
Does it support device finding?
No
0Votes
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Supports device locating features.
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Offline Data Storage
Does it support offline data storage?
Yes
0Votes
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Stores data locally without immediate sync.
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OTA Updates
Does it support OTA updates?
Yes
0Votes
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Supports over-the-air firmware updates.
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Multi Device Pairing
Can it pair with multiple devices?
No
0Votes
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Allows pairing with multiple devices.
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Airplane Mode
Does it include airplane mode?
No
0Votes
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Disables wireless communication when enabled.
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Indicates CE certification for EU markets.
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RoHS Compliant
Is it RoHS compliant?
Yes
0Votes
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The product is RoHS compliant, which means it adheres to the Restriction of Hazardous Substances directive, ensuring it limits the use of certain harmful materials for environmentally safer manufacturing.
Indicates compliance with hazardous substance regulations.
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FCC Certified
Is it FCC certified?
Yes
0Votes
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The device has FCC certification which confirms compliance with regulatory standards in the United States.
Indicates FCC certification for wireless transmission.
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Radiation Level
What is the radiation level?
0
COLMI R02
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Ultra Low
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Radiation levels emitted by the device are ultra low, ensuring user safety during prolonged wear.
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