Please keep in mind that all Macs have a "Line-In" port and NOT a "Mic" port, the two work mechanically different other than having the same socket as a headphone jack. Line-In is not powered, meaning you'll be able to connect an externally powered Mic to that port via a male-male audio jack. Generally, computers that ship with Windows have "Mic" ports, which offer additional power to a mic that does not have it's own power source. Hope this helps!