Introduction
This manual provides detailed instructions for the setup, operation, and maintenance of your MASTER & DYNAMIC MH40 Over-Ear Wireless Headphones Gen II. Please read this manual thoroughly to ensure optimal performance and longevity of your device.

Image: MASTER & DYNAMIC MH40 Wireless Over-Ear Headphones banner, showcasing the product name and design.
Product Overview
The MH40 Wireless Over-Ear Headphones Gen II are designed for superior audio quality and comfort. Key features include:
- Custom Titanium Drivers: Enhanced, precise sound with deep bass and clear treble.
- Extended Battery Life: Up to 30 hours of playtime on a single charge.
- Quick Charge Capability: 6 hours of listening after just 15 minutes of charging.
- Bluetooth 5.2: Reliable wireless connectivity up to 30 meters (100 ft).
- Optional USB-C Audio: Digital audio support up to 24-bit/96kHz via USB-C to USB-C cable.
- Dual Microphone Array: Features proprietary wind noise reduction technology for clear calls.
- Premium Materials: Constructed with lightweight anodized aluminum, coated canvas, and soft lambskin-leather for durability and comfort.
- Removable Magnetic Ear Pads: Offers superior noise isolation and ease of maintenance.

Image: Front view of the MH40 Gen II headphones in Silver Metal / Tan Leather.

Image: Close-up view of the MH40 earcups and headband, highlighting the material and design.

Image: MH40 headphones shown in a folded position, demonstrating their portability.
Setup
1. Charging the Headphones
Before initial use, fully charge your MH40 Gen II headphones. Connect the provided USB-C charging cable to the headphone's charging port and to a power source (e.g., computer USB port or USB wall adapter).
- A full charge provides up to 30 hours of listening time.
- For quick charging, 15 minutes of charge time yields approximately 6 hours of listening.

Image: MH40 headphones illustrating the "Boundless Battery" feature, emphasizing long battery life.

Image: Close-up of the power buttons on the MH40 headphones, showing the LED indicator.
2. Bluetooth Pairing
- Ensure the headphones are charged and powered off.
- Press and hold the power button until the indicator light flashes, indicating pairing mode.
- On your device (smartphone, tablet, computer), navigate to the Bluetooth settings.
- Select "MH40 Gen II" from the list of available devices.
- Once connected, the indicator light on the headphones will change to a steady color or turn off, depending on the model.
The MH40 Gen II uses Bluetooth 5.2 for a stable connection up to 30 meters (100 ft).
Operating Instructions
Controls
The MH40 Gen II headphones feature intuitive controls for managing audio playback and calls. Specific control functions may vary slightly but generally include:
- Power Button: On/Off, Pairing mode.
- Volume Controls: Adjust audio output level.
- Multi-function Button: Play/Pause, Skip tracks, Answer/End calls.
- Mute Button: Located on the right side for quick microphone muting during calls.
For detailed control mapping, refer to the companion mobile application (if available) or the quick start guide included with your product.

Image: Close-up view of the controls on the MH40 headphones, showing buttons and ports.
Making and Receiving Calls
The dual microphone array with wind noise reduction ensures clear communication.
- Answer/End Call: Press the multi-function button.
- Reject Call: Press and hold the multi-function button.
- Mute Microphone: Use the dedicated mute button during a call.
Wired Connection
For digital audio up to 24-bit/96kHz, connect the headphones to your device using a USB-C to USB-C cable. This bypasses Bluetooth and can be useful for high-fidelity audio or when battery is low.
Maintenance
Proper care will extend the life and maintain the performance of your MH40 Gen II headphones.
- Cleaning: Use a soft, dry cloth to clean the exterior surfaces. For leather parts, use a specialized leather cleaner if necessary. Avoid harsh chemicals or abrasive materials.
- Ear Pads: The magnetic ear pads are removable for easy cleaning or replacement. Gently detach them and clean as needed. Ensure they are securely reattached.
- Storage: When not in use, store the headphones in a cool, dry place, away from direct sunlight and extreme temperatures. Use the provided carrying pouch to protect them from dust and scratches.
- Avoid Moisture: Do not expose the headphones to water or excessive moisture.

Image: MH40 headphones with one ear pad removed, demonstrating the magnetic attachment for easy maintenance.

Image: MH40 headphones displayed on a stand, illustrating proper storage.
Troubleshooting
If you encounter issues with your MH40 Gen II headphones, refer to the following common solutions:
| Problem | Solution |
|---|---|
| Headphones do not power on. | Ensure the headphones are fully charged. Connect to a power source and check the charging indicator. |
| Cannot pair via Bluetooth. |
|
| No sound or poor sound quality. |
|
| Microphone not working during calls. |
|
Specifications
| Feature | Detail |
|---|---|
| Model Name | MH40 |
| Connectivity Technology | Wireless (Bluetooth), Wired (USB-C) |
| Wireless Communication Technology | Bluetooth 5.2 |
| Bluetooth Range | 30 Meters (100 ft) |
| Included Components | Headphones, USB-C Charging Cable, USB-C to USB-C Audio Cable (specific cables may vary by package) |
| Material | Aluminum, Leather, Canvas |
| Control Method | App, On-ear controls |
| Battery Life | Up to 30 Hours |
| Earpiece Shape | Over Ear |
| Noise Control | Sound Isolation |
| Item Weight | 2.38 pounds |
| Manufacturer | MASTER & DYNAMIC |
| UPC | 850060736537 |
Warranty and Support
MASTER & DYNAMIC products are engineered to last and are covered by a limited warranty. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official MASTER & DYNAMIC website.
For technical support, product inquiries, or warranty claims, please contact MASTER & DYNAMIC customer service through their official channels. You can often find support information on the manufacturer's website or by referring to the contact details provided in your product packaging.
Manufacturer: MASTER & DYNAMIC
For further assistance, visit the MASTER & DYNAMIC Store on Amazon.