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Amazon.com: Movo TCB1 3.5mm TRS (Female) Microphone to TRRS (Male) Smartphone Adapter with Headphone Jack for iPhone and Android : Electronics
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3.5mm (1/8) 4-Pole (TRRS) Audio Jack Terminal Block : ID 2915 : $2.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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