NASCAR Car Harness Racing Communications They can be wired for

They can be wired for mono earbuds as well but stereo is the most common

Supports IMSA helmet kits with IMSA-to-NASCAR adapter

Slim-line molded Y-block and are pre-wired for easy installation in any type of helmet

While this helmet kit is wired like a typical NASCAR style helmet kit

NASCAR Car Harness Racing Communications They can be wired forNASCAR Car Harness (3 Conductor) 1 4" Switchcraft metal helmet jack for lasting durability 3 Conductor System using 1 4" Stereo Jacks and Plugs Robust Y Block with 6 foot leads for helmet and PTT (Push To Talk) Use with 1 4" NASCAR Helmet Kits Supports IMSA helmet kits with IMSA to NASCAR adapter. EasyLink 5 pin connector allows use with most hand held radios