fire alarm notification appliance

What is the meaning of fire alarm notification appliance ...

Most notification is intended to initiate occupant evacuation and sometimes relocation. The means differ according to the situation. For example, the notification appliances used in a public school may be different than those used in a nursing home. In some situations, staff is needed to implement evacuation or relocation.Notification appliances can use audible, visible, tactile, textual, or even olfactory stimuli to alert the occupants of a fire. Evacuation signals may consist of audible and/or visible appliances (such as strobe lights) with a distinct audible tone. Speakers can deliver live or pre-recorded  instructions to the building  occupants.

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