Makers4Good Splitter Set 100% Profits to Charity The Rockit splitter allows you to use older headsets with separate mic / headphone leads. It can also be used to allow input of 2-contact mono mics. The Wiretap allows you to use two sets of headphones and still use the mic on one set. <span class="a-text-bold">The Wiretap</span> - 3.5mm 4-pin Combo Audio Male =&gt; 3.5mm 4-pin Combo Audio Female + 3.5mm 3-pin Stereo Audio Female; <span class="a-text-bold">The Rockit</span> - 3.5mm 4-pin Combo Audio Male =&gt; 3.5mm 2-pin Mic Female + 3.5mm 3-pin Stereo Audio Female.