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Thread: Audio two pin adapter (two size pins)
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Old Jun 30, 2025 | 10:27 pm
  #2  
der_saeufer
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Join Date: Dec 2010
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Every time I've seen it, the plug with one 3.5mm and one 2.5mm jack is for airline-provided headphones with active noise cancelling. The 2.5mm jack provides the power; if you're using your own headphones, you can plug into just the 3.5mm jack since you only want the sound.
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