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 (Black) - Newegg.com
Amazon.com: Heyiarbeit 15pcs 3.5mm PCB Panel Mount 3 Pin Female Audio Headphone Jack Socket Stereo Connector for Phones Audio Video Equipment Players PJ318 Black Tone : Electronics