NASCAR Car Harness Racing Communications While this helmet kit is

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

the microphone impedence and style does not always allow for the same universal interchangeability with a standard NASCAR helmet kit

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

The Nerdie NASCAR System is a 3-conductor race communication system designed by a racer for racers

Spiral shielding provides superior protection against radio frequency (RF) and electro-magnetic (EM) interference

NASCAR Car Harness Racing Communications While this helmet kit isNASCAR 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