The PCV 05 Combo Audio Adaptor is 2 x 3.5 mm Stereo input jacks outputting to a single 3.5 mm 4 pole output jack. This adaptor allows Sennheiser's PC gaming headsets with 2 plugs (one for microphone and one for stereo audio) to be used with Mac and PS4. This adaptor will also allow smart phone compatibility to PC headsets.