Klein Electronics Agent MultiPin M3 Single Wire C-Ring Earpiece for Motorola/EF Johnson RadiosKlein Electronics Agent MultiPin M3 Single Wire C Ring Earpiece for Motorola EF Johnson Radios Single Wire Earpiece with sturdy "C" swivel earloop with clear audio speaker that rests on the ear. In line PTT button & microphone Great for shift workers needing to share earpieces Left or right ear usage Compatibility: EF Johnson: 51SL, 5000, 5100, 7700 Series, VP600, 900 Motorola: GP900, 9000, HT1000, JT1000, MT1500, MT2000, MTS2000, MTX8000, 838, 900,