HT1000, MTS2000, XTS2500, XTS3000, XTS3500, XTS5000, MT2000, JT1000, MTX8000, MTX9000, GP900, GP1200, MTX838. 1 x Audio Adapter for Motorola Radio HT1000. The headset transmits directly from air acoustic tube, So it is not sensitive to the background noise.
eBay