Default tab pro 8.4 and headphones with microphone

I have a simple question. If I use "headphones with microphone" on his tablet,
is the microphone on the headset going to work or is the tablet going to pick up
the sound only with its own microphone?

In other words... I'm trying to figure out is the device headphones input is hooked
up for both: - the headset AND the microphone.......or the headsets only.