How to record my voice by headphone on mac mini

Hi all,
How to record my voice by headphone on mac mini. The headphone have a microphone. It can record on window 7, but on mac mini, it's not working.
I don't know why. Please help me.
Thanks.

Open Quicktime Player
File Menu: New Audio Recording....
However... if the headphone/microphone combination has two 3.5mm jack plugs (pink and green) then the microphone output (pink) is "mic.level" - which is TOO QUIET for the audio input on a Mac, which is expecting the much stronger "line.level" signal strength.
Solutions: get a microphone pre-amplifier between the mic and the Mac (not cheap); or a different microphone with a USB interface.

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