Wheelock MT-12/24R This is a horn-only multi-tone alarm. Brand WheelockModel MT-12/24RManufacturer WheelockType Alarm (Horn)
System Sensor CO1224T Category : System SensorThis is a Carbon Monoxide detector which can run off of a “normal” voltage of 12/24VDC.
FCI S241575-FC Category : FCIUnlike my other FCI-rebranded System Sensor SpectrAlert Classic, this one does not have an FCI logo on the front.