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Earphone Audio Jack 3.5mm Connector Stereo Adapter Male Female RCA Audio Mono Channel Plug to Screw Terminal Mono Channel Plug - AliExpress
Stereo to Mono Audio Converter - Vanco International
Amazon.com: C2G Legrand RCA Male to RCA Female Signal Splitter Cable, Black RCA to RCA Splitter, 6 Inch Audio Stereo Y-Cable, 26 AWG Audio Signal Converter Cable, 1 Count, C2G 03177 : Electronics