School PA systems are used for operational and emergency communications within a school.
School PA systems allow for live broadcasts, playing of pre-recorded music and scheduling of events such as a class change. Live broadcasts can be executed from a number of broadcast points. The modern PA systems are network based, thereby allowing live broadcast from Mics, Telephones etc.
Additionally, apps allow for communications from a Smart Phone. The Mobile device needs to be on the same network as the speakers. This allows an administrator with the ability to make an announcement to a individual classroom, office or the entire school.