1. Introduction
This manual provides comprehensive instructions for the Hugrow Smart Ring R20. It covers product setup, operational guidelines, maintenance, and troubleshooting to ensure optimal performance and user experience. Please read this manual thoroughly before using your Smart Ring.

Image: People engaged in cycling, illustrating the active lifestyle that the Hugrow Smart Ring is designed to support through its fitness tracking capabilities.
2. Product Overview
The Hugrow Smart Ring R20 is a wearable device designed to integrate health monitoring and smart access control into a compact form factor. It features NFC capabilities for convenient interactions and sensors for tracking various health metrics.
Key Features:
- NFC Wireless Access Control: Utilize the ring for secure and convenient access to compatible systems.
- Sleep Monitoring: Track sleep stages (deep, light, REM) and wakefulness to analyze sleep quality.
- Sports Data Monitoring: Record calories burned, exercise distance, and heart rate during physical activities.
- Health Information Monitoring: Continuous monitoring of heart rate, blood oxygen, and blood pressure (where applicable) through the companion application.

Image: The Hugrow Smart Ring R20, showcasing its sleek design and internal sensor technology, alongside its compact charging case.
Package Contents:
- Hugrow Smart Ring R20
- Charging Case
- USB Charging Cable (Type-C)
- User Manual (this document)
3. Setup
3.1. Sizing and Fit
Ensure the Smart Ring fits comfortably on your finger for accurate data collection. Refer to the sizing guide below to determine the correct size.

Image: A detailed sizing chart for the Hugrow Smart Ring, providing measurements for various ring sizes to help users find their optimal fit.
3.2. Charging the Smart Ring
Before initial use, fully charge your Hugrow Smart Ring. Place the ring into its charging case and connect the USB cable to a power source. The charging indicator will show the charging status.
- Battery Life: Up to 7 days on a full charge.
3.3. App Installation and Pairing
To access full features and health data, download the companion application. The app is compatible with both iOS and Android smartphones.
- Scan the QR code provided in the packaging or search for "Smart Health" in your device's app store.
- Install the application.
- Open the app and follow the on-screen instructions to create an account and pair your Hugrow Smart Ring via Bluetooth. Ensure Bluetooth is enabled on your smartphone.

Image: Screenshots from the companion application, illustrating the user interface for activity monitoring and health data display.
3.4. NFC Setup for Android Devices
The Hugrow Smart Ring supports NFC functions for various applications, including access control and quick links. For Android devices, follow these steps to configure NFC:
- Ensure your phone's NFC feature is turned on. This is crucial for the device to recognize the Smart Ring.
- Install a compatible NFC Label Tools application from the Google Play Store.
- Open the NFC Label Tools app to explore various NFC interaction options (e.g., Text, URL, Phone number, Visiting card, Bluetooth, Wi-Fi network, Application, Location, Data, Favorites).
- To program a URL, select the "URL" option.
- Enter the desired web page link (e.g., a product page, personal website).
- Tap "OK" and then approach the Smart Ring to your phone's NFC zone to write the data.
- Exit the app. Test the programmed NFC function by tapping the ring to your phone's NFC zone again. The linked page should open automatically.
Video: An Android NFC Smart Ring Tutorial demonstrating how to program the ring for URL access using an NFC Label Tools application.
4. Operating Instructions
4.1. Health Tracking
The Hugrow Smart Ring continuously monitors various health metrics. All data is synchronized with the companion app on your smartphone.
- Heart Rate: Provides 24-hour heart rate monitoring.
- Blood Oxygen (SpO2): Measures blood oxygen levels.
- Steps & Calories: Tracks daily steps, distance, and estimated calories burned.
- Sleep Monitoring: Automatically detects and analyzes sleep patterns, including deep sleep, light sleep, and REM sleep.

Image: A smartphone screen displaying comprehensive health tracking data from the Hugrow Smart Ring, including heart rate, steps, and sleep analysis.

Image: A person sleeping peacefully, accompanied by a smartphone displaying detailed sleep quality analysis provided by the Hugrow Smart Ring.
4.2. NFC Functions
The NFC chip embedded in the Smart Ring allows for various contactless interactions.
- Access Control: Use the ring to unlock compatible NFC-enabled door locks or access control systems. Align the NFC logo on the ring with the sensing area of the lock.
- Quick Links: Program the ring to open specific URLs, make phone calls, send text messages, or share contact information by tapping it against an NFC-enabled smartphone.

Image: A composite image demonstrating the Hugrow Smart Ring's NFC capabilities for smart access control, including unlocking household doors, gaining corridor access, and functioning as an elevator card.
Video: A short demonstration of the Hugrow NFC Smart Ring being used for access control, highlighting its convenience.
Video: An overview of the Hugrow Smart Ring's features, including NFC functions and health monitoring, showcasing its integration into daily life.
5. Maintenance
- Cleaning: Wipe the ring with a soft, damp cloth to remove dirt or residue. Avoid harsh chemicals or abrasive materials.
- Water Resistance: The Hugrow Smart Ring R20 is IP68 waterproof. This means it can withstand immersion in water up to 1.5 meters for up to 30 minutes. It is suitable for daily wear, including showering and swimming in shallow water. However, avoid prolonged exposure to hot water or high-pressure water jets.
- Storage: Store the ring in a cool, dry place when not in use.
6. Troubleshooting
| Issue | Possible Cause | Solution |
|---|---|---|
| Ring not charging | Loose connection, faulty cable/charger, dirty charging contacts. | Ensure the ring is correctly seated in the charging case. Check the USB cable and power adapter. Clean charging contacts on both the ring and case. |
| NFC not working | Phone NFC off, incorrect alignment, app issue, ring not programmed. | Verify NFC is enabled on your phone. Ensure the ring's NFC logo is aligned with your phone's NFC reader. Re-program the NFC function using the NFC Label Tools app. |
| App not connecting to ring | Bluetooth off, ring out of range, app glitch. | Ensure Bluetooth is on and the ring is close to your phone. Restart the app and/or your phone. Re-pair the ring in the app settings. |
| Inaccurate health data | Improper fit, sensor obstruction, ring not worn correctly. | Ensure the ring fits snugly but comfortably. Clean the sensors on the inside of the ring. Wear the ring on the recommended finger (typically index or middle finger). |
7. Specifications
| Feature | Detail |
|---|---|
| Model Number | R20 |
| Brand | Hugrow |
| Connectivity Technology | Bluetooth |
| Wireless Communication Standard | Bluetooth |
| Compatible Devices | Smartphone (iOS, Android) |
| Display Type | No Display |
| Band Material Type | Silicone |
| Water Resistance | IP68 |
| Item Weight | 2.89 ounces |
| Package Dimensions | 2.99 x 2.95 x 1.26 inches |
8. Warranty & Support
The Hugrow Smart Ring R20 comes with a standard warranty. For specific warranty terms and conditions, please refer to the product packaging or contact Hugrow customer support.
Customer Support:
If you encounter any issues or have questions regarding your Hugrow Smart Ring R20, please visit the official Hugrow website or contact their customer service team for assistance. Contact information can typically be found on the product packaging or the brand's official online store.





