The adaptor can connect extra accessory with 3.5mm JACK (M2) and also have one Push-To-Talk on.
The adaptor is suitable for Motorola Adaptor - GP900, GP9000, HT1000, JT1000, MT1500, MT2000, MTS2000, MTX8000, MTX838, MTX900, MTX960, MTX9000, MTX1000, PR1500, MTX-LS, XTS1500, XTS2500, XTS3000, XTS3500, XTS5000.