Скачать или смотреть School Bell System

https://www.visiplex.com/school-bell-...
*Wireless Bell System for K-12 Schools*
-Provide bell alerts and instant messaging throughout your school regardless of size
-Create custom bell schedules for your school
-Wireless bell and clock synchronization throughout the school area
-Easy system expansion, relocation and cost-effective wireless installation
-Upgradable to include two-way voice communications with classroom wireless intercom stations

*Add, Replace or Upgrade your existing School Bell System*
-Replace an old, non-functioning school bell system without running wires
-Add indoor/outdoor wireless speakers to improve bell alerts coverage across the school area
-Expand an existing bell system into other buildings without running wires
-Upgrade your current bell system to be synched with clocks