XTS5000 PMMN4045B: This PMMN4045B is the MOTOROLA ORIGINAL PMMN4045B Remote Speaker Mic. This PMMN4045B Remote Speaker Mic is ALSO Noise Canceling. See below for all Radio Models that this PMMN4045B will fit. Please note all of the Motorola Product numbers that the PMMN4045B is also known as and has replaced NMN6191, NMN6191B, NMN6191C, PMMN4045A, AND NOW KNOWN AS (PMMN4045B). 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: •High quality background noise cancelling microphone •Crystal clear audio