INVESTIGATOR M3 LAPEL MIC KIT FOR EF JOHNSON & MOTOROLA RADIOS - XTS SERIES. - Clear tube earpiece can be worn on either ear. - Earpiece has field replaceable components. - Low profile lapel microphone with easy-to-use push-to-talk button. - Sturdy metal clothing clip attaches to shirt or jacket. - Kevlar reinforced cable guarantees reliability. Compatible with these radio models: Motorola: GP900, GP9000, HT1000, JT1000, PR1500, MT1500, MT2000, MTS2000, MTX8000, MTX838, MTX900, MTX9000, MTX960, MTX-LS, XTS1500, XTS2250, XTS2500, XTS3000/Astro, XTS3500, XTS4250, XTS5000. EF Johnson: 5000, 5100 and 7700 Series, 511X, 512X, 514X, 518X, 515L ES, 515ES Ascend Series.