4C IMSA Wired Helmet Kit with Speakers and Mic is designed for road racing and trusted in sports car series such as LMP2, GT3, GT4, and TCR. Loud, clear audio and driver communication is provided by helmet speakers, while a dynamic noise-canceling microphone provides clear voice transmission. Precise mic positioning is allowed by a full-flex boom mic, and the loud speakers mean you'll never miss a conversation. This kit is compatible with standard IMSA car harnesses using a 4-conductor (4C) plug. Installation involves using hot glue or a Rugged Quick Mount (sold separately) to install the mic boom and cable junction block.