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InLine® Audio Plane headphone adpter cable, 2x 3.5mm M to 3.5mm F 3pin, 0.15m | Y-Adapter Cable | Jack -> jack | Cable | Product Overview | INTOS ELECTRONIC AG - Online Store
![Anyone know what the third hole in airline headphone jacks are for? It's smaller than the other two in use. : r/whatisthisthing Anyone know what the third hole in airline headphone jacks are for? It's smaller than the other two in use. : r/whatisthisthing](http://aerosavvy.com/wp-content/uploads/2014/02/plug.jpg)
Anyone know what the third hole in airline headphone jacks are for? It's smaller than the other two in use. : r/whatisthisthing
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3 Packs For Airplane 3.5mm Jack Headphone Plug Adapter Good Rest Airline Black|Earphone Accessories| - AliExpress
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