BBK-FDCH Interface Control Module - ManualThe BBK-FDCH interface control module provides quick and easy connections to Ford & Dodge Charger steering wheels push buttons. Can be used in conjunction with a siren that has light control functionality such that the connected devices can be controlled by either the steering wheel controls “OR” the siren controls. These siren inputs are feedback protected (i.e. steering wheel activation of that output does NOT send power back through the siren input).