StarTech.com - 3.5mm 4 Position to 2x 3 Position 3.5mm Headset Splitter Adapter - F/M

The MUYHSMFF headset adapter features two 3.5mm 3-position ports that provide a separate headphone and microphone connection that can be connected to the single audio port on your laptop. Simply connect the headphone plug from your headset into the audio output port marked with the headphone symbol, and connect the microphone plug into the audio input port marked with the microphone symbol.