Schools can be equipped with the DMS-12 wireless call/alarm system as a riot alarm system. The T-12 alarms are installed in classrooms in this case. The teachers are given an R-12 mobile receiver and can see the classroom in which the alarm was triggered when a call comes in. It is also possible to trigger special calls from the mobile wireless receiver to alert other teachers. The base station of the DMS-12 call system is set up in the secretary’s office and is also notified wirelessly in the event of an alarm. As an option, overview boards can be added to the wireless system in the hallways. These inform everyone in the vicinity of the hazards in the building.