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YCS Basics 3.5mm Smartphone TRRS Headset to TRS Headphones Adapter (Removes The Microphone Channel)4 conductor (TRRS) plugs typically have 3 black insulating rings and 3 conductor (TRS) plugs typically have 2 black insulating rings.This adapter is only to convert a 4 conductor TRRS plug or stereo headset and microphone plug to a 3 conductor TRS plu..