This Fire Alarm Siren is used with the alarm host. When the alarm host detects fire, it will activate the alarm siren. The siren will send out both loud sound and quick flash light to remind people escape from the fire. It is suitable to be used in office shop hotel restaurant etc. Fire alarm system has a number of devices working together to detect and warn people through visual and audio appliances when smoke, fire, carbon monoxide or other emergencies are present.