Garmin CATALYST Extension Cable with Input | HEC-10-CATALYSTThis 4 Conductor Garmin CATALYS Extension Cable connects to the Garmin CATALYST and gives extra length for your driver's helmet kit cabling. 4 C (IMSA Wiring) Garmin CATALYST adapter with Helmet kit extension coil cable. Features input from the Garmin CATALYST. Input Adapter for audio coaching from Garmin CATALYST 4 C 4 Conductor (IMSA style wiring) Coiled Design for flexible extension High Quality Cabling Part: HEC 10 CATALYST