How Loud Is a Security Alarm Siren? Decibel Levels Explained
Most security alarm sirens typically produce between 100 and 120 decibels (dB) at a distance of one meter. Indoor sirens generally fall in the 100–110 dB range, while outdoor models are often louder, reaching 110–120 dB or more for long-range or industrial applications. Some high-powered sirens can reach up to 130 dB, but these usually require an additional amplifier or specialty module. This high volume ensures the alarm is clearly heard, helping to deter intruders and alert nearby individuals.
For a clearer idea of what these decibel levels sound like, please refer to the chart below.
dB Level | Sound Examples | dB Level | Sound Examples |
10 dB | normal breathing | 80 dB | police siren |
20 dB | rustling leaves | 90 dB | power tools |
30 dB | whisper/soft music | 100 dB | motorcycle |
40 dB | refrigerator | 110 dB | nightclub |
50 dB | moderate rainfall | 120 dB | rock concert |
60 dB | normal conversation | 130 dB | ambulance siren |
70 dB | vacuum cleaner | 140 dB | gun shot
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