Covert Acoustic Tube Bodyguard Earpiece Headset with Microphone for Yaesu Vertex Radio VX-231 Clear Acoustic Tube Covert Earpiece Earphone Headset PTT(Push To Talk) with built-in line mic microphone for Yaesu Vertex VX-231 Radio Bodyguard FBI Security Door Supervisor. Clip this hands free earpiece onto your shirt and begin using your radio device to communicate discretely and easily, whether you're in security, retail, or hospitality. Ideal for demanding covert security applications where sound clarity and earpiece durability are of paramount importance. Excellent for use in police, military, nightclubs, bars, paintball, security, restaurants, hotels, bouncer, warehouses, and noisy environments. Compatible with Yaesu Vertex VX-231 Radio.