How to upgrade your Peltor Comtac XPI (or XP) to a communication headset - YouTube
3M PELTOR ComTac XPI - YouTube
US! TCA Comtac XPI Pickup Noise Reduction Headset Tactical Army Green Replica | eBay
3M™ Peltor™ ComTac XPI Headset- Dual Lead NATO Wired Flex Mic, MT20H682FB-19B | 3M New Zealand
Silent Professional Tactical - 3M Peltor Comtac XPI Tactical Headset Available at Silent Professional Tactical Headset designed for military personnel to help reduce exposure to hazardous levels of noise, improve situational awareness