PMMN4045B: This is a Replacement for the Original Motorola Remote Speaker Mic. This is distributed by Battery Distributors for the original PMMN4045B. See below for all Radio Models that this PMMN4045B will fit. Please note all of the Motorola Product numbers that the NMN6191 is also known as NMN6191, NMN6191C, PMMN4045A, AND NOW KNOWN AS (PMMN4045B). This speaker microphone retains the highly popular look and feel of our best selling original version but adds a background noise cancelling microphone as a standard feature. This come with the highest 3 year warranty on the market, better than the 12 month motorola. This Remote Speaker Mic fits the following radio models: MOTOROLA GP900, GP9000, HT1000, JT1000, MT2000, MTS2000, MTX8000, MTX838, MTX900, MTX9000, MTX960, MTX-LS, XTS2500, XTS3000Astro, XTS3000, XTS5000, PR1500. EF JOHNSON MODEL: 51SL, 5000 series, 5100 series, 7700 series, Multi-net Ascend. 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 •Three year warranty