20pcs/lot 3.5mm Male Stereo Jack Plug Audio Headphone soldering connector
Amazon.com: Duttek 3.5mm Male to Male Audio Adapter, Metal Silver 3 Pole 3.5mm Stereo Jack to 3.5mm Stereo Jack Adapter, 1/8 Inch Male to Male Audio Headphone Jack Coupler Connectors - 2 Pack : Electronics
3.5mm Audio Jack (TS, TRS, TRRS Type Audio Jack) Wiring Diagrams & Datasheet