StarTech.com Headset adapter for headsets with separate headphone / microphone plugs - 3.5mm 4 position to 2x 3 position 3.5mm M/F - Turns a 3.5mm audio output port into two distinct ports:
StarTech.com 3.5mm 4 Position to 2x 3 Position 3.5mm Headset Splitter Adapter | punchout.shidirect.com
EnLabs Headphone Splitter For Computer,3.5mm 4 Position to 2 x 3 Position 3.5mm Headphone Mic Audio Y Splitter Cable,F/M - 3.5mm Smartphone Headset to PC Adapter-Black - Newegg.com
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StarTech MUYHSMFFADW 3.5mm 4 Position to 2 x 3 Position 3.5mm Headset Splitter Adapter M/F - White Headphone Microphone Splitter - 4 pin / 4 pole - Walmart.com