IMSA Helmet Plug and Switchcraft jack for all standard 3.5mm ear plugs.
This racing helmet kits feature a straight coiled cord easy to use, prewired mount system. Durable polyurethane insulation provides strength, flexibility and resistance to abrasion while spiral shielding provides superior protection [3M shrink wrapped] against radio frequency RF and electro-magnetic EM interference.
Add Professional Series Challenger II foam ear bud speakers with 18" mono plug. For the clearest race radio communications possible. Challanger II are #1!
Utilizing a hearing aid transducer instead of a standard speaker, expect unmatchable clarity from these ear buds.
HD blue cabling
Knowles Hearing Aid speakers
18" mono plug