First of all, you need 2 bnc connector plugs and one audio line. Such the photo below:

For the first time, shut down your computer.
The 3.5 mm plug is inserted to your computer.
Then connect them with your earphone like this:

If you want to pull the earphone out or insert it, first you can pull out the 2 audio plugs. (Such the photo below, the black plug and red plug are audio plugs)

Why do you need to shut down the computer when insert the earphone?

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