CablesOnline 9-inch 3.5mm (1/8") TRRS 4-Pole/3-Rings Male to 3X Female
Why Some Earphones & Headphone Jack Have 1, 2 Rings how to work - YouTube
The 19th Century plug that's still being used - BBC News
Amazon.com: StarTech.com White Slim Mini Jack Headphone Splitter Cable Adapter - 3.5mm Audio Mini Stereo Y Splitter - 3.5mm Male to 2x 3.5mm Female (MUY1MFFADPW),White - Slim
HyperGear 3.5mm Stereo Auxiliary Cable - Black – HYPERGEAR
3.5mm. Minijack multi male connector, metal (4 rings)
Do you know this? : why earphone jacks have 1,2 and 3 rings - YouTube
3.5mm Audio Jack (TS, TRS, TRRS Type Audio Jack) Wiring Diagrams & Datasheet