1. Introduction
This user manual provides detailed instructions for the safe and effective use of the Wellue BabyO2 S2 Multifunction Heart Rate and Oxygen Monitor. Please read this manual thoroughly before operating the device and retain it for future reference. The BabyO2 S2 is designed to continuously track your baby's blood oxygen level (SpO2), heart rate, and body movement during sleep. It is intended for general wellness and health purposes and is not a medical device. It is not intended to diagnose, treat, cure, or prevent any disease or medical condition.
2. Product Overview

Image Description: The complete Wellue BabyO2 S2 system, including the main monitor unit, the base station, the sensor with soft straps, and a smartphone displaying the ViHealth application with real-time oxygen level and pulse rate data.
The Wellue BabyO2 S2 system consists of a main unit (monitor), a sensor, a base station, and a charging base. It offers continuous monitoring and real-time alerts for abnormal readings.
2.1 Package Contents
- 1 Main Unit (Monitor)
- 1 Sensor
- 1 Base Station
- 1 Charging Base
- 1 Charging Cable for Main Unit
- 1 Type-C Charging Cable
- 1 Spare Soft Strap
- 1 User Manual
- 1 Service Card
- 1 Personalized Sticker
2.2 Key Features
- Continuous Monitoring: Tracks blood oxygen level (SpO2), heart rate, and sleep movement.
- Real-time Alerts: Base station and mobile application provide alerts for abnormal SpO2 levels, heart rate, or baby movement.
- Adjustable Thresholds: Alarm thresholds for SpO2 and heart rate are customizable via the device, base station, or app.
- Comfortable Design: Soft bandages are suitable for infants aged 0-3 years, accommodating different foot sizes.
- Easy to Use: No complex network settings required; the device is ready for use out-of-the-box and connects automatically after startup.
- Data Management: Free iOS/Android application and PC/Mac software allow for unlimited export, printing, and sharing of detailed PDF/CSV reports.
- Long Battery Life: Main unit operates for up to 16 hours; the base station provides continuous use for up to 7 days.
2.3 Device Components

Image Description: An illustration showing the Wellue BabyO2 S2 main unit, sensor, and a smartphone displaying the app interface, with various components labeled such as OLED Screen, Volume, ON/OFF button, Heart Rate, Charging Base Station, Bluetooth, Real-time Trends, Sensor, and Soft Bands.

Image Description: A composite image displaying the four main parts of the Wellue BabyO2 S2 system: the BabyO2 S2 Monitor (sensor and main unit), the Base Station, the Charging Base, and a smartphone screen showing the ViHealth App interface with real-time metrics and historical trends.
3. Setup
3.1 Charging the Device
Before first use, ensure both the main unit and the base station are fully charged.
- Connect the main unit to its charging cable and charging base.
- Connect the base station to the Type-C charging cable.
- Allow sufficient time for a full charge. The main unit provides up to 16 hours of operation, and the base station up to 7 days of continuous use.
3.2 Assembling the Sensor
Attach the soft strap to the sensor unit. Ensure it is securely fastened.
3.3 Initial Power On and Pairing
The device is designed for ease of use and typically pairs automatically.
- Press the ON/OFF button on the main unit to power it on.
- Power on the base station.
- The main unit and base station will automatically connect.
- For smartphone connectivity, download the "ViHealth" application from your device's app store (iOS/Android).
- Open the app and follow the on-screen instructions to connect to the monitor via Bluetooth. No complex network settings are required.

Image Description: A sleeping baby with the Wellue BabyO2 S2 monitor attached to their foot. An illustration shows the main unit displaying "98% Blood Oxygen" and "116 Heart Rate," indicating automatic pairing upon booting without cumbersome network settings.
4. Operating Instructions
4.1 Wearing the Sensor
Proper placement of the sensor is crucial for accurate readings.
- Place the sensor on your baby's foot, ensuring the soft strap is snug but not too tight. The sensor should be positioned correctly to detect blood flow.
- The soft bandages are designed for comfort and adaptability for infants aged 0-3 years.

Image Description: A baby lying on their back, wearing the Wellue BabyO2 S2 sensor on their foot. An overlay indicates "Monitor SpO2 & Heart Rate," demonstrating the device in use for continuous tracking.

Image Description: A close-up image showing an adult's hand gently holding a baby's foot, with the Wellue BabyO2 S2 sensor securely attached. This highlights the comfortable and secure fit of the sensor.
4.2 Monitoring Data
Once the sensor is correctly placed and the device is powered on, monitoring begins automatically.
- Base Station Display: The base station provides real-time display of your baby's SpO2 and heart rate.
- Mobile Application: For detailed real-time metrics and historical trends, use the ViHealth app on your smartphone.

Image Description: The Wellue BabyO2 S2 main unit displaying current readings, alongside a smartphone showing the ViHealth app interface. Icons indicate monitoring of Blood Oxygen, Heart Rate, Body Movement, and alerts for Invalid Value, emphasizing comprehensive monitoring.
4.3 Alarm Settings
You can customize the alarm thresholds to suit your preferences.
- Adjust the alarm volume and threshold values for SpO2 and heart rate directly on the base station, the main unit, or through the ViHealth application settings.
- The system will alert you via the base station and the app if readings fall outside the set parameters or if significant body movement is detected.
5. Application Usage (ViHealth App)
The ViHealth app enhances the monitoring experience by providing detailed data, historical trends, and report generation.
- Real-time Data: View current SpO2 levels, heart rate, and perfusion index (PI) on your smartphone.
- Historical Trends: Access graphs and summaries of past monitoring sessions.
- Report Generation: Export, print, and share detailed PDF or CSV reports of your baby's data. This feature is useful for sharing information with healthcare providers.
- Settings: Customize alarm thresholds, volume, and other device settings directly from the app.

Image Description: A hand holding a smartphone displaying the Wellue ViHealth application. The screen shows current oxygen level (97%) and pulse rate (79), along with historical trend graphs for both metrics, illustrating the app's data visualization capabilities.

Image Description: A laptop screen displaying a detailed "Sleep Report" generated by the Wellue software. The report includes graphs and data points for oxygen levels and heart rate over time, demonstrating the comprehensive reporting feature.
6. Maintenance
6.1 Cleaning
- Wipe the main unit, base station, and sensor with a soft, dry cloth.
- For disinfection, use a cloth lightly dampened with isopropyl alcohol (70%).
- Do not immerse any part of the device in water or other liquids.
- Ensure the device is completely dry before storage or next use.
6.2 Storage
- Store the device in a cool, dry place, away from direct sunlight and extreme temperatures.
- Keep out of reach of children.
6.3 Battery Care
- Recharge the device regularly, even if not in frequent use, to maintain battery health.
- Avoid fully discharging the batteries for extended periods.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No Reading / Inaccurate Readings |
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| Device Not Powering On |
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| App Not Connecting to Device |
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| Alarms Not Sounding |
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8. Specifications
| Parameter | Value |
|---|---|
| Brand | Wellue |
| Model | BabyO2 S2 |
| Main Material | Polycarbonate (PC) |
| Main Unit Battery Life | Up to 16 hours |
| Base Station Battery Life | Up to 7 days (continuous use) |
| Compatible Devices | Smartphone (iOS/Android), PC/Mac |
| Display Size (Main Unit) | 3.3 inches |
| ASIN | B09BVFNZYF |
| Batteries Included | 2 Lithium-polymer |
| Product Dimensions | 19.2 x 16.2 x 8 cm; 528 grams (Package) |
9. Warranty and Support
The Wellue BabyO2 S2 Multifunction Heart Rate and Oxygen Monitor comes with a one-year warranty. For technical support, warranty claims, or any questions regarding the product, please refer to the service card included in your package or visit the official Wellue support website.
Important Note: This device is not a medical device and is not intended for medical use or to replace a medical device. Consult with a healthcare professional for any medical concerns.





