OEM BDN6676B: Black Audio Adapter 3.5mm jack with PTT(push to talk) switch is on the adapter.
Audio accessory adapter for headset with Motorola Visar pin plug
Adapter compatible with the following Motorola and Johnson radio:
GP900, GP9000, HT1000, JT1000, MT2000, MTS2000
MTX838, MTX900, MTX960, MTX1000, MTX8000, MTX9000, MTX-LS
XTS2000, XTS2500, XTS3000 Astro, XTS3500, XTS5000