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ESTONE (2 Pack) 3.5mm 4 Pin Female to 2x3.5mm 3 Pin Male Headphone Converter Head Audio Splitter Y Adapter Cable, 0.3M 1FT (Gray) - Newegg.com
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Delock Products 65344 Delock Headset Adapter 1 x 3.5 mm 4 pin Stereo jack male > 2 x 3.5 mm 3 pin Stereo jack female (OMTP)
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NeweggBusiness - StarTech.com MUYHSFMM 3.5mm 4 Pin to 2x 3 Pin 3.5mm Headset Splitter Adapter Female to Male