ARC B42055 Neckband Earpiece. The B42 Series Neckband Headset incorporates an adjustable neckband and is made of high impact polycarbonate that is lightweight and durable. The rotationally wrapped Kevlar cord with inline PTT can be modified with the optional remote PTT. The PTT is attached to clothing with a 360-degree clip for secure and precise placement. The Knowles microphone transmits crisp and clear voice communication. Compatible with Motorola EX500, EX560XLS, EX600XLS, EX600, PRO-7150, PRO-9150, GL-200GP388, and GP344 two way handheld walkie radios.