It was easy to see from the postal envelope that this was someone's return. The clamshell was taped back with duct tape. But I decided to try it instead as it doesn't seem to have been actually used (the plastic seal was still intact with the original packaging). It works, but not very well. All of the headphones I use have a lot of static electricity no matter what connector I use. Microphones don't get much better care. Unfortunately I missed the return window. Take my advice and keep looking.
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