Compatibility: This Earpiece hub headset compatible with ICOM radios that required two pin plug with two screws. Including: IC-F11, IC-F12, IC-F14, IC-F15, IC-F21, IC-F22, IC-F22SR, IC-F24, IC-F25, IC-F25S, IC-F31, IC-F31GT, IC-F33, IC-F34GS, IC-F34GT, IC-F41, IC-F44GS, IC-F44GT, IC-F4029, IC-F4002, IC-F4003 and many more.