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When used with Series Exceder and AS Audible Strobes, the DSM Sync Module provide independent operation of synchronized temporal pattern (code 3) horn and synchronized strobe flash, as well as the ability to silence the horn while maintaining the strobe flash. while using only a single pair of wires. The dual output sync module, DSM-12/24 provides for control of either a Class A or two (2) Class B NAC circuits.