ExpertPower 2-wire Surveillance Earpiece PTT Mic for Motorola GP328 Plus GP338 Plus GP338XLS GP638XLS GP344 GP344R GP366R GP388 GP388R GP628 Plus GP638 Plus GP629 Plus GP639 Plus GP644 GP688 EX500 EX560 EX560XLS EX600 EX600XLS PRO5150 Elite PRO5151 Elite PRO7150 Elite PTX700 Plus PTX760 Plus PTX800 Plus PTX860 Plus GL200 GL2000