Compatibility: This Earpiece is compatible with all Motorola radios that required single pin (2.5mm) plug, Including: T4000, T4500, T4800, T4900, T5000, T5100, T5146, T5200, T5300, T5320, T5400, T5410, T5412, T5420, T5422, T5500, T5512, T5522, T5532, T5550, T5600, T5620, T5700, T5710, T5720, T5725, T5800, T5820, T5900, T5920, T5950 T6000, T6200, T6210, T6220, T6222, T6250, T6300, T6310, T6320, T6400, T6500, T6510, T6550, T7000, T7100, T7150, T7200, T7400, T7450 T8000, T8500, T8550, T9000, T9500, T9550, T9650, T9680 T9500R, T9500XLR, T9580XLR, XTL446, XTR446, PMR446, SX500, SX620R, SX700, SX709R, SX750, SX800, SX900, SX920R FV200, FV300, FV500, FV600, FV700, FV750, FV800 EM1000, EM100R, EM1020R, FR50, FR60, XTR, XTR446, XTX446 TLKR T3, TLKR T4, TLKR T5, TLKR T6, TLKR T7, TLKR T8, TLKR T9 etc. Cobra CX Series: CXR900, CXR920. CXR700, CXR800. Cobra MT Series: MT100, MT200, MT250, MT300, MT550, MT750, MT800, MT975. Cobra Li Series: Li3900, Li4900, Li6000, Li6500, Li7000. Cobra MRH Series: MRHH100, MRHH200. Cobra 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.