Siemens U-MHU-MCS Category : Siemens I believe that this alarm is capable of doing multiple tones. Brand SiemensModel U-MHU-MCSManufacturer SiemensType Alarm (Horn/Strobe)
EST 882-2B Category : EST/EdwardsThis unit has an electronic horn rather than an electromechanical mechanism.
FCI MS-2 Category : FCIThis is an earlier generation MS-2. The metal piece on the inside which holds the handle open once it has...