I use this extension between Kenwood D74A and Kenwood speaker mic and it works fine. Channels A and B connect in the same way and respond in the same way, completely freeing up the two-pin connector on that expensive radio. The length is perfect for placing the radio where it suits you and is not constrained by the speaker mic's relatively short coiled cord. I liked it so much that I bought 3 more for my two amigos and for myself :) - KB3EOF
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