Firex 120-557C Without Horn?

I just replaced the smoke detector in my apartment, and I realized it doesn’t have a horn. Any reason why?


It appears to be modified due to those holes drilled through the plastic case. It looks like the horn would be located on top of those three metal contacts to the right of the LEDs. No idea why it would have been removed, though.

The horns in those small FireX alarms are actually just discs that are on top of those metal tabs. The cover has a short round tube inside where the sound hole is, which keeps the disk in place and directs the sound out. It doesn’t have a casing like the horns in First Alerts do. Did a disk come out when you took the cover off?

Yes. I eventually found it and put it back together.