The ARC G34014 Earloop, Swivel Style Earpiece can be worn on the left or right ear and provides a universal fit. This high-quality, Knowles brand, lapel mic includes active noise reduction and delivers the highest quality voice audio. The cord is wrapped in Kevlar for strength, reliability, and durability. The microphone is securely attached with a 360-degree rotating clothing clip. Vertex with two mounting screws - VX130, VX160, VX180, VX210/A, VX261, VX264, VX400, VX410, VX420, VX354, VX451, VX454, VX459, VX230, VX231, VX350, VX351, VX417. VX427, VX450, VX426, EVX530, EVX531, EVX534, EVX539 (eVerge)