1. Introduction
Welcome to the CNBRO Smart Ring user manual. This guide provides detailed instructions on how to set up, operate, and maintain your smart ring. The CNBRO Smart Ring is designed to monitor various health and fitness metrics, including heart rate, blood oxygen saturation, sleep patterns, and daily activity. Please read this manual thoroughly to ensure proper use and to maximize the benefits of your device.
2. What's in the Box
Upon opening your CNBRO Smart Ring package, you should find the following items:
- 1x CNBRO Smart Ring
- 1x Ring Box
- 1x User Manual (this document)
- 1x Magnetic Charger

Image: The CNBRO Smart Ring in white, along with its magnetic charger and packaging.
3. Product Overview
The CNBRO Smart Ring is a compact and durable wearable device designed for continuous health monitoring. It features a ceramic construction, making it crack, dust, and water resistant. The ring integrates advanced sensors to provide comprehensive data on your well-being.
Key Features:
- Health Monitoring: Tracks heart rate, blood oxygen saturation (b-oxyg), and sleep patterns.
- Activity Tracking: Records steps, distance, calories burned, and supports multi-sport modes.
- Durable Design: Ceramic material offers crack, dust, and water resistance.
- Long Battery Life: Up to 3-5 days of use on a single 0.5-hour charge, with 7 days standby.
- Smartphone Compatibility: Works with Android 6.0+ and iOS 12.0+ via Bluetooth 5.2.

Image: A close-up view of the black CNBRO Smart Ring, showcasing its internal sensor technology.
4. Specifications
| Feature | Detail |
|---|---|
| Model Name | XTJUS-SR02b |
| Brand | CNBRO |
| Product Dimensions | 0.28 x 0.59 x 0.14 inches |
| Item Weight | 4.9 ounces |
| Battery | 1 Lithium Ion battery (included), 15mAh |
| Charging Time | Approximately 0.5 hours |
| Usage Time | 3-5 days (typical use), 7 days (standby) |
| Operating System Compatibility | Android 6.0 and above, iOS 12.0 and above |
| Connectivity Technology | Bluetooth 5.2 |
| Special Features | Fitness Tracker, Heart Rate Monitor, Blood Oxygen Monitor, Sleep Tracker, Pedometer |
| Material | Ceramic (Crack Resistant, Dust Resistant, Water Resistant) |
5. Setup Guide
To begin using your CNBRO Smart Ring, follow these steps:
- Charge the Ring: Before first use, fully charge your smart ring using the provided magnetic charger. Connect the charger to a USB power source. The ring should fully charge in approximately 30 minutes.
- Download the App: Search for the official CNBRO Smart Ring application on your smartphone's app store (available for Android 6.0+ and iOS 12.0+). Install the application.
- Create an Account: Open the app and follow the on-screen instructions to create a new user account or log in if you already have one.
- Pair the Ring:
- Ensure your smartphone's Bluetooth is enabled.
- Open the CNBRO Smart Ring app and navigate to the device pairing section.
- The app will search for nearby smart rings. Select your ring from the list to initiate pairing.
- Follow any additional prompts on the app to complete the pairing process.
- Wear the Ring: Wear the smart ring on your preferred finger. For optimal accuracy, ensure the sensors on the inside of the ring are in good contact with your skin.
6. Operating Instructions
The CNBRO Smart Ring continuously collects data in the background. All data is synchronized with the companion app on your smartphone.
6.1. Heart Rate Monitoring
The ring monitors your heart rate throughout the day and night. You can view your current heart rate, daily averages, and historical data within the app. The app can also provide notifications for unusually high or low heart rates, or irregular rhythms.

Image: A graphic depicting the smart ring's ability to capture detailed heartbeat information, showing a heart rate waveform.

Image: A smartphone screen showing the "Heart Health" section of the app, displaying current heart rate (80 BPM) and historical data like minimum, average, and maximum heart rates.
6.2. Blood Oxygen (SpO2) Monitoring
The smart ring provides accurate blood oxygen saturation (SpO2) data. This feature allows you to monitor your oxygen levels, which can be helpful for understanding your respiratory health and overall well-being. Data is accessible through the app.

Image: Two smartphones displaying the CNBRO app interface, showing blood oxygen detection results, with a smart ring in the foreground.
6.3. Sleep Tracking
Wear the ring overnight to track your sleep patterns. The app analyzes your sleep stages (light, deep, REM) and provides insights into your sleep quality. You can set sleep goals and routines within the app to improve your sleep hygiene.

Image: A smartphone screen showing detailed sleep analysis from the CNBRO app, including sleep stages, next to a person sleeping peacefully.
6.4. Activity Tracking
The smart ring functions as a pedometer and activity tracker, recording your steps, distance traveled, and calories burned. It supports various multi-sport modes, allowing you to monitor specific activities and set exercise goals. Real-time data, such as heart rate zones during workouts, is available in the app.

Image: A graphic illustrating "Comfortable Activity" with various icons representing different sports and activities surrounding a smart ring.
6.5. Remote Control Photography
The smart ring may offer a remote control photography feature, allowing you to trigger your smartphone camera remotely. Refer to the app's settings for activation and usage instructions for this specific function.
7. Charging and Battery Life
Your CNBRO Smart Ring is equipped with a 15mAh Lithium Ion battery. It charges quickly and offers extended use.
- Charging Time: Approximately 0.5 hours (30 minutes) for a full charge.
- Usage Duration: 3 to 5 days of typical use.
- Standby Time: Up to 7 days.
To charge, simply place the ring onto the provided magnetic charger, ensuring the charging contacts align. Connect the USB end of the charger to a standard USB power adapter or computer port.
8. Maintenance
To ensure the longevity and optimal performance of your CNBRO Smart Ring, follow these maintenance guidelines:
- Cleaning: Wipe the ring regularly with a soft, dry, or slightly damp cloth. Avoid using harsh chemicals, abrasive materials, or strong detergents, as these can damage the ceramic finish and sensors.
- Water Resistance: The ring is water resistant. However, it is not recommended for prolonged submersion or high-pressure water activities like diving. Dry the ring thoroughly after exposure to water.
- Storage: When not in use, store the ring in its box or a safe place to prevent scratches or damage.
- Avoid Extreme Temperatures: Do not expose the ring to extreme hot or cold temperatures, as this can affect battery life and electronic components.
9. Troubleshooting
If you encounter issues with your CNBRO Smart Ring, try the following solutions:
- Ring Not Connecting to App:
- Ensure Bluetooth is enabled on your smartphone.
- Check if the ring is charged.
- Restart both your smartphone and the smart ring (if applicable, by placing it on the charger for a moment).
- Try unpairing and re-pairing the device in the app's settings.
- Inaccurate Readings:
- Ensure the ring is worn snugly on your finger, with the sensors making good contact with your skin.
- Clean the sensors on the inside of the ring.
- Avoid wearing the ring too loosely or too tightly.
- Short Battery Life:
- Ensure the ring is fully charged each time.
- Background app usage and frequent data synchronization can affect battery life.
- Extreme temperatures can reduce battery performance.
- App Crashing or Freezing:
- Ensure your app is updated to the latest version.
- Clear the app's cache on your smartphone.
- Restart your smartphone.
10. Warranty and Support
For any questions, technical support, or warranty claims, please contact the manufacturer or seller directly.
Contacting Support:
If you purchased your product through Amazon, you can typically reach support by following these steps:
- Go to your Amazon account and click on "Orders" in the upper right corner of the page.
- Locate your CNBRO Smart Ring order.
- Click on "Sold by Fusong US" (or the relevant seller name) below the product name on the order page.
- Click the yellow button "Ask a question".
- Select "I need assistance with an order I placed", then click the yellow button "Write message" to send an email.
Support typically responds within 24 hours.