The RT-M4 Radio Transceiver Connection Adapter combines the RT-M1 Transceiver Connection Cable to support most Motorola Multi-pin Connector handheld radios including but not limit to below list of models:

GP Series: GP140, GP320, GP328, GP329, GP338, GP339, GP340, GP360, GP380, GP640, GP680, GP1280

MTX Series: MTX850, MTX850LS, MTX900, MTX950, MTX960, MTX8250, MTX8250LS, MTX9250

HT Series: HT750, HT1250, HT1250LS, HT1550XLS

PR Series: PR860

PRO Series: PRO5150, PRO5350, PRO5450, PRO5550, PRO5750, PRO7150, PRO7350, PRO7450, PRO7550, PRO7750, PRO9150

PTX Series: PTX700, PTX760, PTX78