Introduction
The moofit HW401 Heart Rate Monitor Armband is designed to provide accurate, real-time heart rate data for various fitness activities. Utilizing advanced optical sensor technology, it offers high precision for effective training analysis. This manual provides essential information for setting up, operating, maintaining, and troubleshooting your device.
What's in the Box
- Optical Heart Rate Sensor x 1
- Armband x 1
- Charging Cable x 1
- Getting Started Guide x 1
Setup
1. Charging the Device
The HW401 comes with a rechargeable battery and a magnetic charging cable. Connect the magnetic end of the cable to the charging points on the back of the sensor. A full charge provides over 20 hours of continuous use.

Image: The moofit HW401 Heart Rate Monitor Armband with its magnetic charging cable, highlighting the 20+ hours of battery life on a single charge.
2. Wearing the Armband
Place the armband on your forearm or upper arm. Ensure the sensor is in close contact with your skin for accurate heart rate readings. The strap is adjustable for a comfortable and secure fit.

Image: A woman demonstrates wearing the moofit HW401 Heart Rate Monitor on her upper arm during a workout, showing proper placement.
3. Powering On/Off and LED Indicators
- Turn-on: Press the start-up button. The LED light will flash blue quickly until a heart rate is found, then the blue light will flash slowly.
- Turn-off: Press the start-up button again. The red LED will flash, indicating the device is entering the shutdown state.

Image: Detail of the moofit HW401's magnetic charging interface and an icon indicating 20 hours of battery life.
Operating
1. Connectivity (Bluetooth & ANT+ Dual Mode)
The moofit HW401 supports both Bluetooth and ANT+ protocols, allowing it to connect to a wide range of fitness equipment and applications. This dual-mode capability ensures broad compatibility with your existing fitness ecosystem.

Image: The moofit HW401 Heart Rate Monitor showcasing its Bluetooth and ANT+ dual-mode connectivity with various fitness devices.
2. Pairing with Fitness Apps and Devices
The device is compatible with iOS 7.0 or above and Android 4.3 or above. It works with most mainstream health and fitness apps such as Wahoo Fitness, Endomondo, Polar Beat, DDP Yoga, Mapmyfitness, iCardio, and more. To pair, ensure Bluetooth is enabled on your smartphone or device, open your preferred fitness app, and follow the app's instructions to add a new heart rate sensor.

Image: The moofit HW401 Heart Rate Monitor demonstrating its compatibility with popular third-party fitness applications.
Video: This video demonstrates the unboxing, setup, and pairing process for the moofit HW401 armband heart rate monitor with a smartphone app.
3. Real-time Heart Rate Tracking
The optical sensor continuously records real-time heart rate data, providing accurate measurements (up to ±1 bpm). This data helps in analyzing your fitness performance and optimizing your training results.

Image: The moofit HW401 Heart Rate Monitor with its high-precision optical sensor active, displaying a graph of real-time heart rate data.
Maintenance
1. Cleaning Instructions
The device is IP67 sweat and waterproof, making it suitable for most sports activities. However, it is not designed for swimming. After use, it is recommended to wipe any moisture from the sensor and the armband. For thorough cleaning, the armband can be rinsed with clean water and laid flat to dry.
2. Battery Care
To maximize battery life, ensure the device is fully charged before long-term storage. Avoid exposing the device to extreme temperatures.
Troubleshooting
- Device not powering on: Ensure the device is fully charged. Connect it to the magnetic charging cable and check for charging indicators.
- No heart rate reading: Verify the sensor is in close contact with your skin. Ensure the armband is worn correctly on your forearm or upper arm.
- Connectivity issues: Make sure Bluetooth or ANT+ is enabled on your receiving device (smartphone, bike computer, etc.). Restart both the heart rate monitor and the receiving device. Ensure the device is within range of the receiving device.
- Inaccurate readings: Ensure the sensor is clean and free from debris. Confirm the armband is snug but comfortable.
Specifications
| Feature | Detail |
|---|---|
| Brand | moofit |
| Model | HW401 |
| Material | Acrylonitrile Butadiene Styrene (ABS) |
| Color | Black |
| Compatible Devices | Smartphones |
| Item Weight | 0.04 Kilograms |
| Battery Life | 20 Hours |
| Sensor Type | Optical |
| Battery Description | Lithium-Ion Polymer |
| UPC | 763333024982 |
| Manufacturer | Wantacme |
| Item Package Dimensions L x W x H | 4.92 x 3.39 x 0.75 inches |
| Package Weight | 0.04 Kilograms |
Warranty & Support
The moofit HW401 Heart Rate Monitor Armband comes with a 1-year manufacturer's warranty. For support or warranty claims, please refer to the contact information provided in your Getting Started Guide or visit the official moofit website.




