Plug your iPhone Earphone into a Standard 3-Conductor Jack
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UNC-LRG adapter enables iPhone compatible 4-conductor TRRS 3.5mm plug earphones to plug into 3-Conductor TRS Stereo devices w/out microphone use.
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USB-C To Headphone Jacks To Plug Your Headphones Into 3.5mm Audio Jack - Times of India
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Apple Lightning to 3.5 mm Headphone Jack Adapter
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How to Wire a Speaker to 3.5mm Jack : 4 Steps - Instructables
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Phone connector (audio) - Wikipedia