The fire alarms emit a pitch high enough to know that when you hear it, you need to get out of whatever building you are in. The alarm is not a musical instrument, by the way.
fire alarms blink to alert you that they are on and working. -SmartyPants11
Fire-Lite Alarms was created in 1952.
Firestore.com and firstalertstore.com are both place where you can purchase fire alarms in bulk online. You can also purchase 3 packs of fire alarms from you local Home Depot.
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Some fire stations offer smoke alarms at little or no cost. Fire stations always have smoke alarms available, to make sure that there community is kept safe.
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Fire Dept.
False Friends and Fire Alarms - 1916 was released on: USA: 8 March 1916
because the fire alarms blink to help you know that they are on, and the small lights create heat. -Riley the Smart(project answer only)
NAPCO Security manufactures intrusion security keypads and alarms, video surveillance and cameras, fire alarms with fire and carbon monoxide detectors,
Once a week.
Apart from smoke alarms, Kidde make many different safety appliances. They also make fire extinguishers, carbon monoxide alarms, escape ladders, key safes, locks and many more.