Single Wire Mic with Acoustic Tube Earpiece and M3 connector for Motorola radios with a multiple pin connector.

Fits these Radio Models:

Motorola: GP900, GP9000, HT1000, JT1000, MT1500, MT2000, MTS2000, MTX8000, MTX838, MTX900, MTX9000, MTX960, MTX-LS, XTS1500, XTS2250, XTS2000, XTS2500, XTS3000/Astro, XTS3500, XTS4250, XTS5000. EF Johnson: 5000, 5100 and 7700 Series, 511X, 512X, 514X, 518X, 515L ES, 515ES Ascend Series