moofit HW401

moofit HW401 Armband Heart Rate Monitor User Manual

Model: HW401

Introduction

The moofit HW401 is a high-precision optical heart rate monitor designed for various fitness activities. It provides real-time heart rate data to help optimize your training. Featuring dual Bluetooth and ANT+ connectivity, it seamlessly integrates with a wide range of fitness equipment and applications. Its IP67 waterproof rating ensures durability against sweat and water, making it suitable for almost all sports, excluding swimming.

What's in the Box

  • Heart Rate Sensor x 1
  • Armband x 1
  • Charging Cable x 1
  • Quick Start Guide x 1
Contents of the moofit HW401 box, including the heart rate sensor, armband, charging cable, and quick start guide.

Image: All components included with the moofit HW401 heart rate monitor.

Product Overview

The moofit HW401 features an optical heart rate sensor for accurate readings. Its lightweight design and adjustable armband ensure comfort during extended use. The device is equipped with a magnetic charging port and an LED indicator for status updates.

Close-up of the moofit HW401 heart rate sensor with green optical lights active, showing a heart rate graph overlay.

Image: High-precision optical HR sensor with active green lights.

Rear view of the moofit HW401 sensor showing the magnetic charging pins and regulatory markings.

Image: Rear view of the sensor with charging contacts.

Setup

1. Charging the Device

Before first use, fully charge the moofit HW401. Connect the magnetic charging cable to the charging pins on the back of the sensor and plug the USB end into a power source. The device provides over 20 hours of continuous use on a single charge.

Close-up of the moofit HW401 sensor's magnetic charging port and the magnetic charging cable.

Image: Magnetic charging cable connected to the sensor.

2. Wearing the Armband

Attach the sensor to the armband. Wear the armband on your forearm, just above the elbow, or on your bicep. Ensure the armband is snug but comfortable, allowing the optical sensor to maintain consistent contact with your skin. The armband is adjustable up to 37.8 cm (14.9 inches).

A person wearing the moofit HW401 armband heart rate monitor on their upper arm.

Image: Proper placement of the armband heart rate monitor on the arm.

Operating Instructions

1. Powering On/Off

To power on the device, press the single button on the sensor. The LED light will flash blue rapidly as it searches for your heart rate. Once a heart rate is detected, the blue LED will flash slowly, indicating it is active and connected.

To power off, press and hold the button until the red LED flashes, then release. This indicates the device is shutting down.

2. LED Indicators

  • Rapid Blue Flash: Device is powered on and searching for heart rate.
  • Slow Blue Flash: Heart rate detected, device is active and connected.
  • Red Flash: Device is powering off.

Connectivity

The moofit HW401 supports both Bluetooth and ANT+ dual modes, allowing it to connect to a wide range of fitness devices and applications simultaneously.

Pairing with Devices/Apps

  1. Ensure the HW401 is powered on and worn correctly.
  2. Open your preferred fitness app (e.g., Wahoo, Strava, Elite HRV) or turn on your compatible fitness equipment (e.g., smart sports watches, GPS bike computers).
  3. Navigate to the sensor pairing or device connection settings within the app or equipment.
  4. Select the moofit HW401 from the list of available devices.
  5. Confirm the connection. The device's blue LED will flash slowly once connected.
Diagram showing the moofit HW401 sensor connecting via Bluetooth and ANT+ to smart sports watches, GPS bike computers, and fitness equipment.

Image: Bluetooth and ANT+ connectivity with various fitness devices.

Image illustrating the moofit HW401's compatibility with various third-party fitness applications.

Image: Compatibility with popular third-party fitness applications.

Maintenance

Cleaning

After each use, especially after intense workouts, gently wipe the sensor and armband with a damp cloth. Do not use abrasive cleaners or harsh chemicals. Ensure the charging pins are clean and dry before charging.

Storage

Store the device in a cool, dry place away from direct sunlight and extreme temperatures. Avoid storing it with sharp objects that could damage the armband or sensor.

Water Resistance

The moofit HW401 has an IP67 rating, meaning it is resistant to sweat and splashes. It is not suitable for swimming or submersion in water.

Troubleshooting

ProblemPossible CauseSolution
Device does not power on.Low battery.Charge the device using the provided magnetic charging cable.
Cannot connect to app/device.Device not in pairing mode; Bluetooth/ANT+ off on receiving device; too far from receiving device.Ensure HW401 is powered on (slow blue flash). Check Bluetooth/ANT+ settings on your app/device. Move closer to the receiving device. Try restarting both devices.
Inaccurate heart rate readings.Armband too loose; sensor not making good skin contact; excessive movement.Adjust the armband for a snug fit. Ensure the sensor is clean and positioned correctly on your arm. Minimize excessive arm movements if possible.
LED light not functioning.Device malfunction.Contact customer support for assistance.

Specifications

  • Brand: moofit
  • Model: HW401
  • Material: Acrylonitrile Butadiene Styrene (ABS)
  • Color: Black
  • Sensor Type: Optical
  • Connectivity: Bluetooth, ANT+
  • Water Resistance: IP67 (Sweat and splash resistant, not for swimming)
  • Battery Life: Approximately 20+ hours (continuous use)
  • Battery Type: Lithium-ion Polymer (Rechargeable)
  • Weight: 7.7 Grams
  • Armband Length: Up to 37.8 cm (14.9 inches)
  • Compatible Devices: Smartphones, Smart Sports Watches, GPS Bike Computers, Fitness Equipment

Warranty and Support

Warranty Information

The moofit HW401 comes with a 1-year manufacturer's warranty. This warranty covers defects in materials and workmanship under normal use.

Customer Support

For any questions, technical assistance, or warranty claims, please contact moofit customer support. You can reach us via Amazon message for 24/7 online support. We are committed to providing the best possible assistance.

For more information, visit the official moofit store on Amazon: moofit Store

© 2026 moofit. All rights reserved.

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