The Klein Electronics Y4-BR Braided Split-Wire Earpiece for Vertex Radios is an excellent choice. It comes with an adjustable earloop split-wire security kit, suitable for both left and right ear use. The braided cables are Kevlar reinforced, providing a tough and snag & cut-free grip. It features a PTT button/microphone combo with a steel clothing clip. There's an available SMEP7 option. And it comes with a 3-year replacement warranty. Compatible with Vertex models like VX130, VX160, VX180, VX210, VX210A, VX230 Series, VX260 series, VX350, VX400, VX410, VX420, VX351, VX354, VX231, VX451, VX454, VX459, EVX531/534/539.

Using this earpiece is easy. First, adjust the earloop to fit your left or right ear. Clip the steel clothing clip to your clothes for a stable position. Press the PTT button when you want to talk on the Vertex radio. When not in use, store it in a dry and clean place. Avoid pulling the braided cables too hard to prevent damage. If you choose the SMEP7 option, follow the additional instructions that come with it. Remember, it has a 3-year replacement warranty, so if you encounter any problems, contact the customer service.