STX STEREO Headset or Helmet Extension Coil Cable Headset or Helmet Extension Coil Cord for the Rugged Radios STX Stereo Intercom is characterized by 30in inches of straight cable and 13in inches of coiled cable, extending fully to 8' feet. It features an STX STEREO Nexus Plug and RF blocking Total Shield. The high-bend test coil cord demonstrates compatibility with Rugged Radios STX STEREO High Fidelity Intercom, Rugged STX STEREO helmet kits and headsets, and other stereo intercoms and helmet kits like PCI Trax.