This kit allows you to replace the wiring inside all WRC DES, ST5 and ST4 rally helmets.
This kit fits into the built-in comm port, unscrew your old electronics from the helmet casing and replace with this kit.
This kit can be used to convert an ST5 GT or ST5 F helmet to use 'full rally' electronics.
This kit will not work with Stilo Trophy Jet, Rally or Plus model helmets.