Kenwood KHS-7A Single Muff Headset w/Boom Mic & In-line PTT

The Kenwood KHS-7A is a lightweight, single speaker headset with microphone. The microphone features a Push-To-Talk (PTT) button, which you can press to speak without touching the radio. A clip is attached to the microphone, and is perfect for attaching the microphone to your collar or lapel.

eBay