The ARC Earpiece G35055 D-ring ear hook fits left or right ear and is comfortable for extended wear. The Knowles lapel microphone with enhanced noise reduction delivers highest quality voice transmittal and has an in-line microphone and PTT. The cord is wrapped in Kevlar for strength, reliability, and durability. The microphone is securely attached with the 360-degree clothing clip. This unit was designed for low noise environments. Motorola EX500, EX600, GL2000, GP328Plus, GP338Plus, GP344, GP388, PRO5150elite, EX560XLS