Simplex 2901-9517 This is essentially the AC-powered version of the Simplex 2901-9833. Brand SimplexModel 2901-9517Manufacturer Federal SignalType Alarm (Horn)
Simplex 477-669 Category : SimplexOddly enough, the model number on this particular smoke doesn’t fit the typical pattern for Simplex devices.
Honeywell S465B Category : HoneywellThis is essentially a slightly modified-looking version of the Honyewell S464A with a two-stage option.