Essential information for daily use, maintenance, and safety.
Thank you for choosing CIRCUL RING 2 MAX. This guide is designed to help you properly wear, use, and care for your ring, ensuring stable and reliable health monitoring while extending the product’s overall lifespan.
1.Daily Wear & Care
Recommended Wearing Position
CIRCUL RING 2 MAX can be worn on any finger. For more stable and continuous physiological data collection, we recommend wearing it on the index finger, middle finger, or ring finger.
Adaptive Fit Explanation
The ring features an adaptive structural design that accommodates minor changes in finger size caused by temperature variations, daily activity, or slight weight fluctuations. This ensures wearing comfort while maintaining data accuracy. For more precise sizing recommendations, please refer to the official size guide or contact customer support.
Cleaning & Water Resistance Notes
CIRCUL RING 2 MAX is rated 5 ATM water resistant, making it suitable for everyday scenarios such as hand washing, showering, and brief contact with water. After water exposure, gently dry the ring with a soft, dry cloth—especially the inner sensor area—to maintain optimal measurement performance. If water or other conductive liquids are present on the ring or sensor surface, do not charge the ring immediately. Ensure it is completely dry before placing it on the charging dock to avoid potential safety risks.
2.Exercise & Activity Recommendations
Daily Activities & General Exercise
The ring is suitable for everyday wear and most low- to moderate-intensity activities such as walking, running, and cycling. It continuously tracks metrics including heart rate and activity-related energy expenditure.
High-Intensity or Strength Training (Important)
During activities that involve strong gripping, frequent impact, or direct contact with hard equipment (such as barbells, dumbbells, or kettlebells), we recommend removing the ring temporarily.
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Reason: Extremely high localized pressure or sharp impacts may affect the ring’s exterior or internal structure.
Load-Bearing Characteristics of the Adaptive Structure (Important)
The adaptive structure of CIRCUL RING 2 MAX is specifically engineered to withstand natural outward tension from within, caused by normal physiological finger expansion during daily wear. This type of expansion will not damage the ring. However, the structure is not designed to withstand strong inward compression, lateral impact, or collisions with hard objects while in an expanded state. Under such abnormal external forces, structural damage may occur. Please take extra care during relevant activities.
3. Environment & General Maintenance
Avoid Extreme Conditions
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High temperature or high humidity: Avoid wearing the ring in saunas, steam rooms, or prolonged high-temperature environments. Continuous heat exposure may affect battery longevity and sensor performance.
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Chemical exposure: Avoid direct contact with detergents, perfumes, lotions, or other chemical substances, as they may damage or corrode the ring’s surface materials.
Proper Storage
When not wearing the ring, store it separately and avoid placing it together with keys, metal objects, or other hard items to minimize the risk of scratches.
4.Charging & Device Compatibility
Use the Designated Charging Accessories
Always use the magnetic charging dock and original charging cable included with CIRCUL RING 2 MAX. This model is not compatible with charging cases or accessories from previous generations. Do not mix or reuse older charging equipment.
Software & Firmware Compatibility
For optimal functionality and performance, ensure that both the CIRCUL RING App and the ring firmware are kept up to date.
Charging Dock Indicator Lights
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Blue light — Ready: Charging dock is powered and on standby
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White light — Charging: Ring is correctly placed and charging
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Green light — Fully charged: Battery is fully charged
First-Time Charging Notice When you first receive your ring, the indicator may display a green light immediately after placing it on the charging dock. This is normal. Please continue charging and wait until the indicator turns white before pairing the ring. This behavior may result from battery level changes during transportation.
Fully Depleted Battery Notice If the ring cannot power on due to complete battery depletion, the indicator light may initially appear green when charging begins. This indicates that the system is performing battery pre-recovery. Please keep the ring on the charging dock; the indicator will switch to white shortly and enter the normal charging process. No action is required.
5.Important Sizing Information
Please note that CIRCUL RING 2 MAX uses a sizing system different from CIRCUL RING 2.
Sizing Changes
The size range for CIRCUL RING 2 MAX has been adjusted. The S size now starts at US size 6.
Upgrade & Replacement Recommendation
If you are upgrading from a previous model to CIRCUL RING 2 MAX, please re-measure your finger size and refer to the latest official size guide. Do not directly reuse your previous ring size.
Official Size Guide
If you need assistance, our customer support team is happy to provide personalized sizing recommendations.
6.Tips for Ensuring Data Accuracy
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Keep your system updated: Regularly update the CIRCUL RING App and ring firmware to benefit from algorithm improvements and issue fixes.
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Wear correctly: Ensure the ring fits securely and that the sensor area maintains good contact with the skin. Avoid excessive looseness or rotation.
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Feature calibration: For Cuff-free Blood Pressure Monitoring, please follow the in-app instructions to complete initial calibration for improved personalized accuracy.
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Regular data synchronization: We recommend opening the CIRCUL RING App at least once every three days to synchronize data. Infrequent app usage may cause the operating system to suspend background processes, leading to delayed or incomplete data. Regular syncing helps maintain data continuity and connection stability.
Important Notice Cuff-free Blood Pressure Monitoring feature is intended for research and innovation purposes only. It is not a medical diagnostic tool.
7.After-Sales Service & Support
If you experience performance issues or product abnormalities, please contact our support team via the Feedback feature in the app or by email at support@circulsense.com. You may also visit our official website or check the “Tips for Today” section at the bottom of the app homepage for the latest product updates and useful insights.
Friendly Reminder | Accidental Damage
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Warranty coverage: The standard limited warranty covers defects in materials and workmanship only. Damage caused by accidents, external environmental factors, or improper use (such as impacts during high-intensity strength training) is not covered.
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Disposal of damaged devices: If the ring becomes severely damaged and unusable, it contains a lithium battery. Please follow local environmental and safety regulations for proper disposal and recycling.
We hope this guide helps you use CIRCUL RING 2 MAX with confidence and gain meaningful health insights every day. Enjoy your experience.
