that vanguard smoke detector might be wired differently for the horn to make that sound! When the horn is on DC power, it makes a squealy sound! When it's on AC power, it makes a buzzing sound!
@Alarmo05221
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Late but the Earli Gard EGD1C has a Edwards Horn but instead of a 120VAC sound that Kobishi Horns can have on the AC terminals and the Edwards horns, these have the sound of a Kobishi squealer horn on the DC terminals instead of AC.
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