Siemens U-MHST-MCS Category : Siemens I believe that this alarm has the ability to produce multiple tones. Brand SiemensModel U-MHST-MCSManufacturer SiemensType Alarm (Horn/Strobe)
Simplex 4901-9811 Category : SimplexThis particular alarm is actually capable of doing three different tones.
Fire-Lite Miniscan 112 Category : Fire-LiteAs the model number indicates, this panel puts out 12 VDC.
