FT-450-FT817-FT818-FT857-FT-897-FT900 headphone/microphone adaptor
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It allows you to connect the headphones with a pre-ampplified FET microphone (electret) with a 3.5mm jack to the RJ45 8-pin modular connector in a practical and fast way.
There is also a 3.5mm jack socket that allows you to apply an external PTT to the nail, button or pedal.