How do I power on my MH40 Wireless Gen 2 Headphones?

Press Power/Pairing button once to power ON/OFF. (Note: Battery level will be displayed at startup via the battery indicator LED.)
 
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When you first open your new headphones, and before listening, please be sure to charge them for at least 15 minutes and download the M&D Connect App to check for firmware updates.
 
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To conserve battery power, headphones will power OFF after 30 minutes of inactivity. This setting can be adjusted in the M&D Connect app.