PCI Race Radios Crew Chief Headset PCI Race Radios are known for enhanced user comfort, fuss-free adjustment mechanisms, along with excellent sound clarity. The Crew Chief Headset from PCI Race Radios is crafted to align with handheld radios and has a strategically placed button on the side to promote an easy push-to-talk feature. Features: 3.5mm female audio input jack on ear cup Adjustable mechanical microphone boom Noise canceling microphone Adapter Cables sold separately