The CRF-300(A) Addressable Relay Module provides a dry contact output that can be activated through panel programming to control auxiliary devices like fans, doors, and dampers. It uses LiteSpeed communication to provide faster response than other designs. Key features include built-in type identification, LED indicator, high noise immunity, and direct-dial addressing. The module uses one SLC loop address and can switch two dry contacts to control notification appliances or other loads rated up to 3A resistive.