A wireless intercom paging system uses wireless intercom units that transmit to wireless public address (PA) receivers placed about the building. Each receiver can have two horn speakers attached for greater coverage area. In addition there are transmitters that can send pre-recorded messages or tones so the system can also be used as an emergency evacuation system as well.
To transmit to the wireless PA units you can use a base station intercom that sits on a desk or wall, or you can use a handheld 2-way radio. That enables you to be mobile and still broadcast messages to the PA system.
If you already have partial building coverage with a wired PA system, we also have a wireless PA interface that enables you to use 2-way radios to broadcast to your hardwired system as well as to new wireless PA receivers for the other areas where you need coverage.
The graphic below shows the components that can go into commercial intercom paging systems.