hardware - What do the 2 pins on the back of the Nexus S do? - Android Enthusiasts Stack Exchange
3M Peltor FL5035 Radio PTT Adapter Cable - Kenwood
Code Red Headsets Single Push-to-Talk for Code Red Nexus Tactical Headsets (Model: 2-Pin Motorola Connector), Tactical Gear/Apparel, Communication - Evike.com Airsoft Superstore
Nexus U-94 A/U M9177/5-2 Peltor PTT Push To Talk MSA PRC 6 Pin 8.5" Long Cable | eBay