XTS2500 Motorola PMMN4045A: The NMN6191C (aka NMN6191B) (Now know as PMMN4045A). THIS IS NOT A MOTOROLA ORIGINAL. This product is made by Impact and comes with a 2 year warranty and will fit the same application as the Motorola original NMN6191B, NMN6191C, and PMMN4045A. When ordering the PMMN4045A you will be sent the Impact aftermarket brand. The PMMN4045A Allows you to talk and listen without removing the radio from the belt, case or charger. Ideal for high noise level environments. The PMMN4045A water resistant microphones include: 6.0" coiled cord assembly, 3.5mm Earjack, swivel clip, and quick disconnect latch. Add a 3.5mm listen only wire for the ultimate accessory solution in high noise environments! Specs: Impact resistant PVC casing Shock, wind, dust and splash resistant Kevlar re-enforced heavy duty coil cable and strain relief High quality background noise cancelling microphone Standard 3.5mm accessory jack Crystal clear audio Two year warranty............................... The PMMN4045A fits the following Radio Models: GP900, GP9000, HT1000, JT1000, MT2000, MTS2000, MTX8000, MTX838, MTX900, MTX9000, MTX960, MTXLS, XTS2500, XTS3000 ASTRO, XTS3500, XTS5000, XTS3000, AND PR1500.....EF JOHNSON: 51SL, 5000 SERIES, 5100 SERIES, 7700 SERIES, AND MULTI-NET ASCEND.