PCI Race Radios Ear Jack For Elite Helmet Wiring Kit Replace the ear jack on your Elite Helmet Wiring Kit with the PCI Race Radios Ear Jack. This replacement features a full flex boom with a mic sock and O-ring, along with a 150-ohm dynamic, noise-canceling mic and a 4-conductor plug for a seamless audio experience. Features: Full flex boom with mic sock and o-ring 150 ohm dynamic, noise canceling mic 4 conductor Plug