The 4C IMSA Wired Straight Cord Helmet Kit with Mic and 3.5mm Jack is specifically designed for road racing. Trustworthy in LMP2, GT3, GT4, and TCR sports car series, this kit with a 4-conductor IMSA configuration integrates seamlessly into most helmets. The kit comprises a dynamic noise-canceling mic, full-flex boom, and a 1/8in jack tailored for mono earbud connectivity. The full-flex boom feature allows precision mic positioning inside the helmet and the dynamic noise-canceling microphone optimizes clear voice transmission. Compatible with standard IMSA car harnesses and requiring mono earbuds for use with 1/8in jack model. Installation involves the mic boom and cable junction block using hot glue or a separately sold Rugged Quick Mount.