Wheelock MT4-115-S 8 Multitone Horn 115VAC Silver 17/02 or monitor type dry contact

or monitor type dry contact initiating device circuits (IDCs) to the Edwards Signaling control panel

An advantage of this single-ended reflective design is that it is much easier to install than the dual-ended projected beam detectors

or SD505-AHS addressable detectors

In addition they have a trouble memory feature that displays past troubles (by NAC) for rapid diagnostics

eBayCompact Addressable Monitor Module

Wheelock MT4-115-S 8 Multitone Horn 115VAC Silver 17/02 or monitor type dry contactThe Wheelock MT multitone horns and horn strobes offer a choice of eight (8) nationally and internationally recognized alerting sounds: Horn, Bell, March Time Horn, Code 3 Tone, Code 3 Horn, Slow Whoop, Siren or Hi Lo Tone. The Code 3 Horn and tone patterns are engineered to comply with NFPA ANSI Temporal Pattern specifications without requiring additional equipment. With MT horns and horn strobes, one alarm appliance meets most of your signaling