This earpiece compatible with two pin Icom radios. Icom F Series F10, F11, F11S, F12, F15, F25, F12S, F20, F21, F21S, F22, F22S, F3, F33GS, F33GT, F34GS, F34GT, F3S, F4, F43GS, F43GT, F43TR, F44GS, F44GT, F4S, F4SR, F4TR, F3002, F4002, F44GS, FS25R.
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