NOT compatible with Cobra Marine HH350 FLT, HH350W FLT, HH450 DUAL, HH450 CAMO, HH550 FLT BT radios.ONLY Compatible with 1-Pin Walkie Talkie Two Way Radio Motorola COBRA Microtalk CXT390 CXT545 CXT531 CXT195 CXT135 CXT145 Compatible Models: MT series: MT200, MT525, MT550, MT600, MT650, MT750, MT800, MT900, MT975,MT100, MT115,, MT250, MT300, MT550, MT615, MT850, PR series: PR240, PR245, PR260, PR350, PR375, PR385, PR550, PR560, PR580, PR590, PR3000, PR3100, PR3175, PR3180, PR3500, PR3550, PR3575, PR4000, PR4200, PR4250, PR4300, PR4700, PR4750, PR5060,PR237,PR650, LI series: Li-3900, Li-4900, Li-5600, Li-6000, Li-6500, Li-6700, Li-7000, Li-7200, Li-7020, Li-7500 CX series: CX80, CX105, CX105C, CX107,CX110, CX112,CX312 CXT series: CXT85, CXT88, CXT90, CXT94, CXT95, CXT125, CXT135, CXT145, CXT175, CXT195, CXT225,CXT227,CXT235,CXT237, CXT275, CXT280, CXT345 CXT390, CXT395, CXT400, CXT420, CXT425, CXT450, CXT531, CXT545, CXT595 CXR series: CXR700, CXR725, CXR750, CXR800, CXR825, CXR850, CXR875, CXR900, CXR920, CXR925, CXR950 CTW Series: CTW135P, CTW285P DC FRS Series: FRS132, FRS237 MRHH Series: MRHH100, MRHH200, MRHH330