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.