A Mass Notification System broadcasts messages to inform employees and occupants of a building in an emergency. It sends real time alerts and instructions to groups and individuals during critical events such as natural or human induced disasters, pandemics, and territorial attacks. It unifies the communication under one umbrella.

To keep everyone informed during a critical event. Being able to communicate and respond quickly along multiple platforms. Mass Communication systems will send one-way messages through email, smartphones, office phones or speakers.

The three main types of mass communication systems are in the building, wide-area, and disturbed recipient. In-building systems are primarily on premises while wide-area uses speakers and beacons. Disturbed recipient notifies occupants via email and smartphone.

The Fire Alarm Voice Evacuation System typically instructs the occupants to evacuate the building by a pre-recorded message. Mass Notification Systems notify occupants of other emergencies that may not necessarily require building evacuation. Mass Notification Systems may give specific instructions based on the type of emergency.