Skip to Content Skip to Footer

Added to your bag

Product Support
MH40 Wireless Gen 2
Wireless Over-Ear Headphones
Manuals and Documentation
    1. Power off headphones.
    2. Press and hold power/pairing button >4 seconds.
    3. Access Bluetooth settings on your source device. Locate "M&D MH40" and connect. A solid light indicates you are connected.
  • The ear pads are connected to the headphone via magnets. To remove, gently pull the ear pad off the headphone. To attach, line up holes on back of ear pads with locator pins on ear cups. The magnets will help pull and lock the ear pads into place.

  • To clean your leather headphones, simply use a quality leather cleaning solution. When not in use, keep your headphones in the provided carrying case to protect them from dirt and other substances.

  • Sound isolation is a passive, physical method of reducing external noise that uses optimized materials to reduce the ambient noise that enters through your headphones. Noise cancellation is an active, electronic method of reducing unwanted ambient sound that adds processed sound to your audio to reduce the perception of ambient noise. Our current headphones achieve very high ambient noise reduction through passive sound isolation techniques.

  • Enter pairing mode and connect to device

    1. Enter pairing mode again and device 1 will disconnect.
    2. Connect to device 2 and turn headphone off.
    3. Turn headphones on and headphones will automatically connect to device 1 and 2 simultaneously.
    4. Pause one device and play from the other to swap headphones connection.
  • 18 Hours of Playtime

    1. Power off headphones.
    2. Press and hold power/pairing button >4 seconds until pairing indicator begins to flash.
    3. Hold down the multi-function button (the button between Vol+ and Vol-).
  • The headphones and device do not pair:

    1. Make sure the headphones are not connected to the charger.
    2. Turn Bluetooth® off, then on again on the source device.
    3. Turn off Bluetooth® feature on any other device that is paired with the headphones.
    4. Power off headphones. Put headphones into pairing by holding the power button > 4 seconds.
    5. Make sure “M&D MH40" is selected in the Bluetooth® device list.
  • To charge, plug in the USB-C Connector and connect to a USB-A port. Please note: you cannot listen while charging.

  • For airplanes or analog listening, plug 3.5mm audio plug into headphone audio input to engage passive (wired) audio. Headphones power off when audio cable is plugged in. Audio will work even if battery is depleted. Microphone and buttons are disabled during passive mode


Master & Dynamic guarantees this product against defects in materials or workmanship for a period of one year from the date of original purchase on our website or from an authorized Master & Dynamic retailer or reseller. As an exception to this warranty period, batteries are guaranteed for proper functioning for a period of one year from the date of original purchase. Defective batteries are covered by Master & Dynamic’s Limited Warranty but battery wear from normal use is not covered.

If returned within the warranty period, Master & Dynamic will at its discretion either repair the defective product or replace it with a repaired or refurbished product of identical specifications as the returned product. This limited warranty is in lieu of all other warranties, expressed or implied, including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose.

Master & Dynamic shall have no liability of any kind for any direct, indirect, incidental or consequential damages or expenses that arise from the use of this product.

Master & Dynamic has partnered with Clyde to allow you to purchase an extended warranty with accidental damage from handling protection coverage for your Master & Dynamic products.

If you have purchased the Accidental Damage Protection Plan through Clyde and are looking to make a warranty claim while your manufacturer warranty policy is still valid, please contact If you have purchased the Accidental Damage Protection Plan through Clyde and are looking to make a warranty claim after the expiration of the manufacturer warranty policy or a claim for accidental damage, click here. Our Accidental Damage Protection Plan through Clyde can be purchased on our website at checkout or after completing your purchase here. For more details on the coverage offered through our Accidental Damage Protection Plan, click here.

Master & Dynamic’s Limited Warranty does not cover normal wear and tear to items such as blown drivers, battery degradation from normal use, cut cords, bent jacks, torn headbands, loss or theft. Replaceable parts such as ear pads and cables will be replaced only in case of malfunctioning due to material or manufacturing defects, and only once during the warranty period of your product.

The serial number and proof of purchase are required in order to enact the warranty for products purchased on our website or from an authorized retailer or reseller. This policy is also applicable to products received as a gift.

If we need to replace your earphones due to a battery defect, your earphones will be new or equivalent to new in performance and reliability. You will void your warranty if you disassemble your headphones or expose them to excessive moisture. If you believe your product is defective within the warranty period, please contact us at Please include your product’s serial number, proof of purchase, telephone number and full return shipping address in your message to us. Conditional to serial number, proof of purchase, and warranty validity, you will be issued a return authorization and instructions for return shipment. Please note that the dispatch of a replacement product will take place after our receipt of the defective product. For questions regarding your product’s warranty, please contact Master & Dynamic Support at