Sound Ideas, ALARM, FIRE - LARGE OFFICE BUILDING: INTERNAL: FIRE ALARM, SLOW BEEPING

This sound effect can be found on Series 6000 Extension I Sound Effects Library, which was made by Sound Ideas. It is a recording of a 1990s-style Simplex Time Recorder voice-evacuation system (either a Simplex 4100 or 4120, or possibly a 4003 voice control panel) sounding in the "chime" alert tone. (Simplex changed the "chime" tone for their 4100U, 4100ES and 4003EC voice-evacuation panels.)

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