Works specifically with H-D OEM alarm systems (TSSM) or H-D turn signal module (TSM) Stops erratic blinking of turn signals Can be used with most custom turn signals (including halogen and LED signals) Module is solid-state waterproof design OK for parade use; does not produce excess heat so emergency flashers may be used for an extended amount of time For use on models with self-canceling turn signals Made in the U.S.A.