CIRCUL RING
CIRCUL RING
Key Highlights 🌟
- Breakthrough Health Monitoring
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- Heart rate tracking: Comparable to medical oximeters, only ±2 bpm.
- Blood oxygen monitoring: The only one with real-time updates every second
- Powered by FDA-certified sensor technology
- Adaptive-Fit for 24/7 Comfort
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- Adaptive Sizing, all-day comfort: Follows natural finger size changes
- One Ring, any finger: No need for exact sizing or replacements.
- Expert-Validated Sleep Monitoring
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- The only smart ring validated by OSA clinical studies
- Complies with AASM sleep standards
- Certified medical device by Japan's PMDA
- Lifetime Health Investment
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- One-time purchase for lifetime use
- No monthly subscription fees
- Portable charging case with 120-hour battery life
FREE SHIPPING
1 Year WARRANTY
30 Days RETURNS
SECURE CHECKOUT
PRODUCT FEATURES
- Adaptive-Fit Design for 24/7 Comfort: 🔄 Revolutionary technology automatically adjusts to finger size changes throughout the day. Perfect skin contact ensures accurate readings while maintaining comfort. Fits multiple fingers without sizing kits.
- Clinical-Grade Sleep Apnea Monitoring: 💤 First smart ring validated for sleep apnea detection through OSA clinical research. Tracks oxygen fluctuations with medical precision, delivering personalized sleep improvement recommendations.
- Real-Time SpO2 Tracking: 🩸 Unmatched real-time blood oxygen monitoring detects health warnings earlier than traditional minute-interval measurements. Ideal for snorers, altitude travelers, and nocturnal monitoring needs.
- Health Tracking with OTA Updates: 📊 Monitors heart rate, HRV, SpO2, activity, stress, and temperature. OTA updates ensure latest features, while the app provides trend analysis and personalized insights.
- No Subscriptions, Extended Battery: 🔋 One-time purchase unlocks all features permanently. 4-7 day battery life with 120+ additional hours from portable charging case. iOS/Android compatible with Apple Health sync. 5 ATM waterproof.
- Professional Fitness Tracking: 🏃Track your workouts with accuracy matching professional chest straps. Real-time heart rate monitoring, and customizable fitness goals help optimize your training effectiveness, whether in the gym or during daily activities..
SPECIFICATIONS
★ Available Sizes: US 4-16;
★ Weight: S: 5.6g, M: 6.5g, M+: 6.8g, L: 7.1g;
★ Ring Battery Life: 3~7 Days;
★ Charging Box Battery Life: 120+ hours;
★ Compatibility: iOS 12+ and Android 8.0+;
★ Waterproof Class: 5 ATM;
★ Warranty: 1-Year Free warranty;
★ Materials: Premium PVD-coated stainless steel — the same material used in luxury watches.
How to Choose Your Size
Measure and confirm your ring size following the guide below.
Step1
Take a length of floss or string and wrap it around the base of your finger.
Step2
Mark where the floss or string first overlaps with a pen.
Step3
Stretch the length of string out along a ruler or measuring tape, and take down the length in millimeters
Step4
The length you measured is the circumference of your finger, compare the circumference of your finger the following table.
# 30-Day Return Policy
1. Full and Partial Refund Conditions
2. Non-Refundable Situations
3. Return Process
4. Refund Processing
5. Special Notes
# Exchange
If the delivered product is in its original condition and unused, but you wish to exchange it for a different size or color, we recommend submitting a return request and placing a new order. You will be responsible for all costs associated with the return. Unless the return is due to defects, damages, or non-compliance, shipping fees, handling fees, or taxes paid will not be refunded.
# Refund
A full refund means you will receive the total amount of your order back if you return the product according to our return policy.
You may be eligible for a partial refund if:
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We find any damages, contamination, wear and tear, or missing parts upon inspecting the returned product. We may deduct the devaluation amount from your refund unless these issues were declared in your return request.
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You received bundled products or gifts. To receive a full refund, we recommend returning all bundled items. If you cannot return them, we may deduct the corresponding amount from your refund.
Please note: You will be responsible for all costs associated with returning the product unless the return is due to defects, damages, or non-compliance, and you have provided supporting photos and descriptions.
Processing Time for Returns or Exchanges
For return requests that comply with our policy, we will initiate the refund immediately upon receiving the returned product. The refund will be processed through the original payment method and may take up to 10 calendar days.
#Warranty Coverage for CIRCUL RING
All original components of new products are covered by a 1-year warranty in non-European Economic Area (EEA) countries and a two-year warranty in EEA countries. Claims must be made directly to CIRCUL with proof of purchase. The warranty applies to the original owner and is transferable to subsequent owners. If damage is due to craftsmanship defects, CIRCUL will repair, replace, or refund.
Exclusions from Warranty Coverage
The warranty does not cover:
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Improper or negligent use, operation, or modification.
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Maintenance contrary to product care instructions.
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Normal wear and tear.
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Rechargeable batteries, which have limited lifespans and are considered consumable items. Battery replacement is not included in the standard warranty.
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Damage or defects caused by accidents.
# Circul Ring Extended Warranty Terms
1. Service Overview:
After purchasing this extended warranty service, the basic warranty period of your smart ring will be extended, with the specific duration determined by the service type you select. During the extended warranty period, you can enjoy free product replacement service at the same standard as the original warranty period.
2. Coverage:
Free replacement with a brand new product is available for manufacturing defects (including sensor malfunction, significant battery life deterioration, material and workmanship defects, etc.) and functional failures that occur during normal use. However, issues that can be resolved through firmware upgrades via the APP are not covered by this extended warranty service.
3. Exclusions:
Human-caused damage resulting from drops, water immersion, crushing, etc. due to failure to follow official operating instructions; malfunctions caused by unauthorized disassembly, modification, or use of non-official accessories; appearance wear and normal aging of consumable parts (such as charging cables) are all excluded from the extended warranty coverage.
4. Service Process:
If your product experiences issues during the extended warranty period, you may apply for after-sales service through the official APP or Customer Support. Follow the instructions to return the product, and after verification that it meets the conditions, a brand new replacement product will be shipped to you within 10 business days.
5. Additional Notes:
This extended warranty service is non-transferable and applies only to the originally purchased smart ring; no refunds are supported after the service becomes effective; the company reserves the right of final interpretation and modification of the extended warranty terms, and users will be notified of any modifications through official channels.
Overview
HRV Precision.
Millisecond Accuracy
One Ring, Any Finger
50 Meters
Water-resistance
Sleep Apnea
Analysis
A Clinical Lab
Wrapped around
Your Finger.
Up to 7 days
Adaptive design
24/7 All-day comfortable fit
Multiple excercise models
SST™ Ultra 2.0 sensors
Subscribe for FREE !
Continuous SpO2 Tracking
All Features
Achieves millisecond-level accuracy, continuously analyzing heart rate variability, which is invaluable for evaluating overall health and stress levels.
Offers real-time tracking with second-level updates help users to assess respiratory health.
Updates data every second with an accuracy of ±2 bpm, providing highly accurate heart rate information to help users promptly identify cardiac health abnormalities.
Achieves an accuracy of ±0.1°C, updating every minute to quickly detect temperature anomalies, especially during menstrual cycle tracking and flu seasons or pandemics.
Sleep Apnea Detection: Capable of identifying the risk of sleep apnea, aiding in the early detection of potential sleep issues.
Lightweight design, support for sleep wear, provide complete sleep data
Real-Time Sleep Monitoring: Thoroughly analyzes sleep stages, including light, deep, and REM (rapid eye movement) sleep, offering detailed sleep quality reports to help improve sleep habits.
Supports monitoring up to 5 types of activities, such as running and cycling
Tracks exercise heart rate during workouts, providing real-time data and post-exercise analysis to help optimize performance.
Whether you're a runner or yoga lover, CIRCUL is designed to help you achieve your activity goals. With over 5 sports modes, it provides real-time heart rate feedback and detailed post-workout analysis. 90% of users report significant progress.
Provides real-time updates every two seconds, supporting heart rate tracking across various activities such as running, swimming, and cycling.
Achieving millisecond-level accuracy, providing continuous analysis of heart rate variability, which is invaluable for assessing overall health and stress levels.
Assesses stress levels through continuous high-resolution heart rate variability (HRV) metrics.
Offers de-stressing and relaxation recommendations based on stress data.
CIRCUL watches over you 24/7. Detecting arrhythmias and oxygen dips in real-time. Day or night, it's your silent guardian. Catch potential issues early. Stay ahead of your health.
More than numbers. ClRCUL reveals your wellness story. Heart rate trends. Sleep patterns. Stress insights. All in one comprehensive, shareable report. Empower your choices. See your health clearly.
How we compare
| Product | CIRCUL | Oura Ring 4 | RingConn Gen 2 | Apple Watch Ultra |
|---|---|---|---|---|
| Price |
Price
$249
|
$349
|
$299 | $799 |
| Design | ||||
| Appearance |
Appearance
 |
|
|
|
| Ring Size |
Ring Size
Only 4 sizes
|
12 sizes
|
9 sizes | 3 sizes |
| Structure |
Structure
Elastic Design: Adapts well for stable, accurate monitoring.
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Fixed Design: reducing accuracy.
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Fixed Design: reducing accuracy. | Wrist-Equipped with an adjustable band |
| Sensors |
Sensors
Triple-Wavelength Photoplethysmography Sensor
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Heart Rate, Temperature, Accelerometer
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Photoplethysmography (PPG) Sensor, Temperature, Accelerometer | / |
| Monitoring Precision | ||||
| SpO2 Real-Time Measurement |
SpO2 Real-Time Measurement
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|
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(no longer available on Apple Watch units sold by Apple in the United States since January 18, 2024) |
| SpO2 Continuous Measurement |
SpO2 Continuous Measurement
(with SpO2 Trend Graph) |
|
|
|
| Heart Rate Data Update Interval |
Heart Rate Data Update Interval
1 second
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>10 mins
|
>10 mins | / |
| Blood Oxygen Saturation Update Interval |
Blood Oxygen Saturation Update Interval
1 second
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>10 mins
|
>10 mins | / |
| Exercise Heart Rate Update Interval |
Exercise Heart Rate Update Interval
1 second
(Accuracy close to a chest strap) |
Several Mins
|
Several Mins | / |
*The comparison data may change over time. Features, specifications, and performance are subject to updates. Please verify with the respective manufacturers for the most accurate and up-to-date information.
“The adjustable size was important to me because my fingers sometimes swell, making other rings uncomfortable. I appreciate that this company has experience with smart rings and FDA approval, which should ensure better quality than newer brands.”
Gavin Hall
Medical Scientist
“My biggest problems with rings is the size. Finally, someone has invented the Smart ring that I can actually wear. My ex football teammates will be quite happy. Nobody has small finger joints that most fit rings over! Thank you!!!!”
Charlie Martin
Medical Scientist
“I’ve been looking for the RIGHT smart ring for some time now, this ring checks all the boxes for me. I’ve struggled with high blood pressure, rings fitting one day but not the next, so the adjustable size is awesome as well as continuous blood-pressure monitoring! ”
Robert Palumbo
Health and Wellness Coach
“This would be my first smart ring I think it’s the most stylish I’ve seen and I love the flexible design, for the functionality I am really looking forward to the health tracking I have some things that this rings tracking will help me with very much…I think this is why it’s a great product”
Benjamin Shullaw
Corporate Executive
“I like the ring because of the flexible sizing and being able to use different fingers. I also wanted one able to show BP and other medical functions. It is a nice looking ring and the colours available are very nice….Shared…”
James Lauzier
Freelancer
Parameter
Specification
S/M/M+/L(Covering refers to circumference)
S: 47-54.7mm,corresponding to US code 4-7;
M: 55.6-59.7mm,corresponding to US code 7.5-9;
M+: 60.9-66mm,corresponding to US code 9.5-11.5;
L: 67.5-76mm,corresponding to US size 12-15.5
Net weight
S:5.6g M:6.5g M+:6.8g L: 7.1g
HeadinPower sourceg
Internal power supply Built-in 3.8V Li-ion battery
Port
Bluetooth(5.0BLE, operating frequency 2.4-2.4835GHz; Modulation mode : GFSK; Frequency hopping: adaptive frequency hopping)
Charging interface
Input voltage: 5V Input current: 12-20mA
Attachment
Ring *1, Charging cradle *1, Type-C Charging cable *1, Manual *1
Waterproof class
5ATM
Charging box battery
230mAH
Charging case quality
38g
What's in the box
circul ring *1
Charging Cradle *1
Type-c charging cable *1
MANUAL *1
Still Got Questions?
Please read our FAQs page to find out more. Still have questions ? Contact our customer support.
CIRCUL RING features Elite Modes designed for users with sleep disorders or conditions requiring overnight blood oxygen monitoring, providing medical-grade SpO₂ monitoring at 1-second intervals. Due to the increased power consumption from these intensive calculations, battery life in this mode is approximately 3-7 days. Additionally, the CIRCUL RING comes with a charging case that has an embedded battery, allowing you to charge the ring anytime, with a charging time of approximately 60 minutes from 0% to 100%.
Overall, you can enjoy 3-7 days of battery life per charge, plus an additional 120 hours with the portable charging case. 🔋The CIRCUL RING, building on the FDA-grade sensor technology of the original Circul+, is designed for precise and comfortable health monitoring. Our proprietary SST™ (Sensor Stabilization Technology) ensures unparalleled data precision, adapting to natural finger size variations of up to 3mm throughout the day.
It provides Near-Medical-grade Health Data with Real-time Tracking at Second-level Intervals, ensuring that critical indicators such as heart rate, real-time blood oxygen, HRV, and blood pressure meet industry-leading accuracy standards.
- Heart Rate (24/7 Continuous monitoring)
- Blood Oxygen Levels (SpO2)
- High Precision HRV monitoring
- Sleep Apnea monitoring
- Temperature
- Blood Pressure (coming soon)
- Real-time Sleep Monitoring
- Exercise Heart Rate
- Activity Tracking
- Steps and Movement
- Energy & Stress
- 1. Check whether the ring is charged fully.
- 2. The distance between CIRCUL and Mobile is within 10cm for bluetooth connection.
- 3. Check whether the Bluetooth function of the mobile phone is turned on.
- 4. Whether the Bluetooth permission of the APP in the phone settings is turned on
- 5. Disassociate ring in APP firstly, and then re-add the ring again
- 6. Try to uninstall and reinstall the “CIRCUL RING” APP, and choose to allow all app permissions during the installation process,otherwise some functions may be unavailable.
To avoid channel conflicts, we operate these products under distinct brand identities to ensure clear differentiation in our product lines. While both CIRCUL+ (CIRCUL Pro) and CIRCUL RING target different markets and applications, they are part of the BodiMetrics smart ring series.
