Wellue SleepU
Wellue SleepU Wrist Pulse Oximeter User Manual
Model: SleepU
1. Introduction
The Wellue SleepU Wrist Pulse Oximeter is designed for continuous monitoring of oxygen saturation (SpO2), pulse rate, and body movement. It is intended for sports and aviation use only and is not a medical device. This manual provides detailed instructions for the proper use, setup, operation, and maintenance of your SleepU device.
Please read this manual thoroughly before using the device to ensure safe and effective operation.
2. Package Contents
Verify that all items are present in your package:
- Wellue SleepU Wrist Unit
- Optical Finger Sensor (Ring Type)
- USB Charging Cable
- User Manual (this document)

Image: Wellue SleepU Wrist Pulse Oximeter with its accessories: the wrist unit, optical finger sensor, USB charging cable, and user manual.
3. Setup and First Use
3.1 Charging the Device
Before first use, fully charge the SleepU device. Connect the USB charging cable to the wrist unit and plug the other end into a USB power adapter (not included) or a computer's USB port. The device display will indicate charging status.

Image: The SleepU wrist unit being charged by connecting its USB cable to a laptop.
3.2 Wearing the Device
Wear the SleepU wrist unit comfortably on your wrist. Attach the optical finger sensor to your thumb or index finger. Ensure the sensor is snug but not too tight to avoid restricting blood flow. The device will automatically begin monitoring once the sensor is properly placed.

Image: A user wearing the SleepU wrist unit and finger sensor, with a smartphone showing the real-time oxygen level and pulse rate data.
3.3 Downloading the Vihealth App
For full functionality and data review, download the "Vihealth" app from the App Store (iOS) or Google Play Store (Android). Search for "Vihealth" and install the application on your smartphone.
3.4 Pairing with the Vihealth App
Open the Vihealth app and follow the on-screen instructions to pair your SleepU device via Bluetooth. You may need to input the last 4 digits of the device's serial number, found on the back of the unit.

Image: Multiple views of the Vihealth app demonstrating its detailed reporting and user-friendly interface for iOS and Android.
4. Operating Instructions
4.1 Automatic Monitoring
The SleepU device automatically starts monitoring when the finger sensor is correctly worn and connected. It continuously tracks your oxygen level, pulse rate, and body movement every 4 seconds.
4.2 Real-time Data Display
The device's small display shows real-time SpO2 and pulse rate. For a more detailed view, open the Vihealth app on your paired smartphone to see live readings and historical data.
4.3 Smart Reminder Function
The SleepU features a smart reminder function. You can set custom thresholds for oxygen levels and vibration intensity within the Vihealth app. If your oxygen reading falls below the set threshold, the device will vibrate intelligently to alert you.

Image: The SleepU device being worn by a sleeping individual, highlighting its smart adjustable vibration reminder feature.
4.4 Data Synchronization and Reporting
The device has built-in memory to store up to 4 groups of data, each up to 10 hours. Data is automatically synchronized to the Vihealth app via Bluetooth when connected. The app can store unlimited data groups and allows you to review, analyze, and share historical data as JPG or CSV reports.
For PC users, download the "O2 Insight Pro" software. Connect the device to your PC using the USB cable to download and view detailed reports.

Image: The SleepU device connected to both a smartphone and a laptop, illustrating its capability to generate detailed reports on both platforms.
5. Important Features
- Unique Ring Sensor: The patented comfortable soft silicon ring sensor is lightweight and designed to stay securely on your finger without slipping, even during sleep. The probe is replaceable.
- Long Battery Life: The rechargeable battery provides up to 16 hours of continuous use on a full charge.
- Automatic Operation: The device automatically starts monitoring when worn and stops when removed.

Image: A visual comparison between a traditional duckbill sensor and the SleepU's patented ring sensor, emphasizing the ring sensor's comfort and non-restrictive design.
6. Maintenance and Care
- Cleaning: Wipe the device and sensor with a soft, dry cloth. Do not use abrasive cleaners or immerse the device in water.
- Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery: Recharge the device regularly, even if not in use, to maintain battery health.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device not turning on. | Low battery. | Charge the device fully. |
| Inaccurate readings. | Sensor not properly placed; excessive movement; strong ambient light. | Ensure sensor is snug; minimize movement; avoid strong light. |
| Cannot connect to app. | Bluetooth off; device out of range; app not updated. | Enable Bluetooth; keep device close to phone; update app. |
| Data not syncing. | Device memory full; app not open during sync. | Sync data regularly; ensure app is open and connected. |
8. Specifications
- Model: SleepU
- Dimensions: 1.6"L x 0.9"W x 0.5"H
- Sensor Type: Wearable Ring Sensor
- Battery: Rechargeable Lithium-Ion
- Battery Life: Up to 16 hours (continuous use)
- Data Storage: Up to 4 sessions, 10 hours each
- Connectivity: Bluetooth (for app), USB (for PC)
- Compatible Apps: Vihealth (iOS/Android), O2 Insight Pro (Windows/Mac)
9. Official Product Video
Watch the official video for a quick guide on how to use your Wellue SleepU Wrist Pulse Oximeter, including setup and basic operation.
Video: A quick guide demonstrating how to use the SleepU oxygen monitor, covering wearing the device, pairing with the app, and syncing data.
10. Important Disclaimer
Note: This device is for Sports and Aviation use only and not intended for medical use. It should not be used to diagnose or treat any medical condition.
11. Support and Warranty
If you have any comments, suggestions, or require technical assistance, please contact our professional after-sales service team. We are committed to providing satisfactory solutions.
For contact information and warranty details, please refer to the official Wellue website or the documentation included with your product.
Ask a question about this manual
Ask about setup, troubleshooting, compatibility, parts, safety, or missing instructions. Manuals+ will review the question and use this page’s manual context to help answer it.

