J&M Performance Series Custom Headset HJC Shorty-style Helmet, Only the finest quality components are used in the manufacture of these headsets Superior ambient noise canceling, wind blocking ability and natural human voice response of the latest version of J&Ms high output AeroMike V Superior audio fidelity has been achieved with large diameter DynaPort, non-ported and ultra-slim helmet speakers. (Proper acoustical installation is required, exact type will vary depending upon application) Versatility of J&Ms durable Z-series 2-piece cord system allows these headsets to be connected to any factory installed motorcycle audio system ever built, now and in the foreseeable future, just by interchanging the lower-section hook-up cord