Headset Buddy Mic-Line Plus - Line-Level Audio + Monitoring Adapter for iPhone & Smartphones
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Amazon.com: Headset Buddy Line-Level Audio Adapter with Built in Attenuation for iPhone, Smartphones, Soundboards and Mixers (iPhone-Mic-Line) : Electronics
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Sescom LN2MIC-ZMH4-GH1 DSLR Cable 3.5mm TRS Line to 2.5mm TRS Mic for Zoom H4N-PRO - 9 Inch
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1/4in Line-Level Pro Plus Audio Adapter | iPhone 3.5mm - 6.35mm Attenuator Cable
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Movo MV-RC100 |3.5mm Line to Mic Attenuator Cable w/ -35dB Signal
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FRONTX - Headphone Microphone Adapter (converter) - 1/8" jack male to header male connector (pin/pinout)