How to use a wired headphone AND a mic at the same time on the Macbook Pro Retina?
You will need the same type of headset that you use with an iPhone. It will have one 3.5mm plug that carries both the stereo audio and mic input (aka a TRRS plug). Some examples are apple's own EarPods, Sennheiser's PX 200-II i's, and any other iPhone headset.