Altronix® NAC POWER EXTENDERS are extremely cost effective. They may be connected to any 12 VDC or 24 VDC Fire Alarm Control Panel (FACP). One key feature is a two-wire horn/strobe Sync mode, which allows audible notification appliances (horns) to be silenced while visual notification appliances (strobes) continue to operate. Other features include Temporal Code 3, Steady Mode, and Input to Output Follower Mode (maintains synchronization of notification appliances circuit). Sync protocols include Potter/Amseco, Faraday, Gentex, System Sensor, and CooperWheelock. UL listed and FM approved. NYC Department of Buildings (MEA) and California State Fire Marshal (CSFM) approved.