Viking Paging System with Amplifier with 2 Speaker Horns Fully Powered for Use Through Phones for Schools, Warehouses, Offices, Autoshops, etc. Complete system with 2 high quality weather resistant paging horn/speakers and power supply included, the system is loud and clear Everything you need to add paging and multiple line loud ringing to any phone system, paging is accomplished by connecting the PA2A Designed manufactured and supported in the USA Newest version: There are many older versions out there that will not work with cable, VoIP, channel bank, etc, phone services