Zeadio G Shape Earpiece Headset PTT for 1 PIN 3.5mm Yaesu Vertex Radio Vx-210 Vx-210a Vx-300 Vx-400 Vx-410 Vx-420 Vx-1r Vx-2r Vx-3r Vx-5r Etc. Excellent for use in police, military, nightclubs, bars, paintball, security,restaurants, hotels, bouncer, warehouses, and noisy environments. Durable and thick cable, designed for tough environment This headset is for All Yaesu/ Vertex radios that required one pin plug