My primary school had the sounder beacon bases, I went back there today after 2 years to test the ziton system and it’s on my channel, i dont know if it’s just me but the sounder beacon bases have a slightly different pitch to the sounder bases.
It looks like one of the smoke detectors from the 80's to me. The different colours though makes it look kinda ugly in my opinion. The alarm does sound nice but I prefer the Apollo XP95 which is all over the UK at the moment.