There are two options for a mic
The wireless ones Microsoft makes
Or you can drill into the side of the hitbox the Ps360+ boards (i don't know about the other pcbs) do have a mic input its seriously just that there's no hole in the box take the backing off to see where to drill and detach the board so you don't accidentally hurt it
I know the hole isn't pretty but id rather use my razer headset than buy another one And with the awesome plexi on the front the hitbox team printed for me i doubt anyone notices it
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