Siemens U-MH-1G This is a multi-tone single-gang horn. Brand SiemensModel U-MH-1GManufacturer SiemensType Alarm (Horn)
EST 882-2B Category : EST/EdwardsThis unit has an electronic horn rather than an electromechanical mechanism.
STI SS-2000F Category : OtherCan’t remember where exactly I put the key for this unit. It can still open with an allen wrench, but...
Edwards 281B Category : EST/EdwardsThis unit is in a bit better condition than my other Edwards 281B.