Earpiece Headset Speaker mic Audio Adapter Adaptor for Motorola Radio GP140 GP320 GP328 GP329 GP338 GP339 GP340 GP360 GP380 GP640 GP650 P680 GP1280 MTX850 MTX850LS MTX900 MTX950 MTX960 MTX8250 MTX8250LS MTX9250 HT750 HT1250 HT1250LS HT1550 T1550XLS PRO5150 PRO5350 PRO5450 PRO5550 PRO5750 PRO7150 PRO7350 PRO7450 PRO7550 PRO7750 PRO9150 PTX700 PTX760 PTX780 This adapter allows the use of any Motorola 2 pin (2.5/3.5mm) accessory to be used on Motorola radios listed below; Plug on and use, no driver/software is needed to use audio accessories.