3C NASCAR Wired Coil Cord Helmet Kit with Mic and 3.5mm Jack is a reliable in-helmet communication kit designed for stock car and short course racers. Trusted by racers from ARCA to local short tracks, it utilizes a 3-conductor NASCAR configuration compatible with standard NASCAR car harnesses. The kit offers a dynamic noise-canceling microphone for crystal-clear voice transmission, a flexible boom mic for accurate positioning inside your helmet, and a 3.5mm jack for mono earbuds. It includes a NASCAR wired helmet kit and a coil cord and requires mono earbuds for use, such as the Challenger II, Challenger Semi, or AlphaBud Mono. Installation is straightforward with a hot glue or Rugged Quick Mount, sold separately.