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The H10-13.4 for helicopter pilots. This model has a 5-foot extended coil cord and a single plug.
DC Part Number - 40411G-02
H10-13 S (NSN 5965-01-447-6273)
A stereo version of the H10-13.4, with a 5 foot straight cord and dual plugs. (Inline Stereo/Mono switch).
DC Part Number - 40422G-01