A fire alarm system has a number of devices working together to detect and warn people through visual and audio appliances when smoke and fire. 

Fire Alarms

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A fire alarm system has a number of devices working together to detect and warn people through visual and audio appliances when smoke and fire etc. 

12V Security Alarm Strobe Signal Warning Lamp Blue Red Flashing Light.  Diameter: 7.2cm  Height: 4cm