IMSA Wired Open Face Helmet Kit with S3 Mic. Complete IMSA helmet kit with flex boom, dynamic mic, speakers, and straight cord. Features: Tough black molded 4-conductor plug. Total Shield RF reflective cable Molder Y block Clear Hear Audio Speakers S3 Dynamic Mic Cloth mic muff Rugged helmet kits offer clear communications and are easy to install. With the new DNC background noise cancelling mics your driver communications will be crystal clear every time.