There are two different wired audio options available with your MW75 headphones
Wired Audio (Analog)
For analog wired audio, please use the provided USB-C to 3.5mm cable and plug it into your headphones' USB-C input. Please note that passive audio is available while the headphones are ON or OFF, however they do need to be powered ON in order for ANC and Ambient modes to work.
Wired Audio (digital)
For digital wired audio, please use the provided USB-C to USB-C cable and plug it into your headphones' USB-C input. This will engage digital USB (wired) audio up to 24-bit / 96 kHz.
Your headphones will automatically power ON if the device supports digital audio.
Please note that phone calls, the Multi-Function button, and volume controls are not supported when using digital wired audio connections.
Only M&D audio cables are compatible with the MW75.