BDN6635C: The BDN6635C is Our Replacement for the Motorola Original BDN6635C. The only difference is our model is not VOX, but comes with a 3 year warranty against manufacturer's defect. Headset with Boom Microphone; noise reduction rating 24dB. Heavy duty headsets include noise canceling boom microphones and can be worn with or without a hardhat. The push-to-talk switch is located on the earcup. Our unit comes with the radio connector making it less expensive because it doesn't require adapter cable, This Headset will fit the following radios: HT1000, JT1000, MT1000, MT2000, MTS2000, MTX838, MTX8000, MTX9000, MTX-LS, XTS2500, XTS 2250, XTS3000, XTS3500, XTS5000 and XTS 4250.