You mean the 4903 series? I honestly never noticed it and they were the most common alarm in my elementary school and second common alarm in my high school.
They were the original version of the TrueAlert, however someone already owned the name QuickAlert and sued Simplex for trademark infringement, so they slightly redesigned the device and changed the name to TrueAlert.
I wouldn’t have bumped it if it hadn’t been for Mattias bumping it in the first place; I don’t know what it is with the way he acts on here sometimes.
If you ask me the ceiling-mount G4S Genesis is pretty good-looking, especially in comparison to the ceiling-mount TrueAlertES speaker/strobe; the latter looks like a TrueAlertES ceiling speaker with a 4904-series strobe crudely attached to the side (which I guess is essentially what it is).
That particular device can come in both electronic horn & speaker versions. Not sure who the original manufacturer is, but I know both Federal Signal & Simplex sold it under their brand names.