Simply plug this mic speaker into your radios, you could chat with your partners without holding your radio on hand. Compatible Ham Radio Model: BF-888S, BF-UV5R, BF-UV5RA, BF-UV3R, BF-666S, BF-777S, KPG27D, KPG29D, KPG48D, KPG49, KPG55D, KPG56D, KPG62D, KPG66D, KPG69D, KPG70D, KPG74D, KPG75D, KPG77D, KPG82D, KPG87D, TH-D7, TH-D7A, TH-D7AG, TH-D7E, TH-F6, TH-F6A, TH-F7, TH-F7E, TH-G71, TH-G71A, TH-G71E, TH-K2, TH-K2A, TH-K2E, TH-K2ET, TH-21, TH-21AT, TH-21BT, TH-22, TH-22A, TH-22AT, TH-22E, TH-25, TH-26, TH-27, TH-28, TH31AT, TH31BT, TH41AT, TH41BT, TH-42, TH-42A, TH-42AT, TH-42E, TH-45, TH-46, TH-47, TH-48, TH-55, TH-75, TH-77, TH-G71, TH-205, TH-215, TH-225, TH-235, TH-235A, TH-235E, TH-315, TH-415, TK-208/308, TK-220/320, TK-240/340, TK-240D/340D, TK-248/348, TK-250/350/353, TK-260/360, TK-260G/360G, TK-270/370, TK-270G/370G, TK-272G/372G/373G, TK-278G/378G/388G Pro-Talk, TK-430/431, TK-2100/3100 Pro-Talk, TK-2102/3102 Pro-Power, TK-2107/3107 Pro-Talk, TK-2160/3160, TK-2170/3170/3173, TK-2200/3200, TK-3101/3131 Free-Talk, TK-3130.TK-2207/3207.