Features: Advanced Microprocessor Design, Two-way Open Voice Communications Among Administrators and Speaker Stations, Multi-channel Open Voice Communication Paths, Interconnection to EKSU or PABX Systems, Capacity for 300 Speaker Stations, Architectural Station Numbering, Multi-channel Full Duplex Telephone Communications, Handset or Push-to-talk Microphone/Speaker Console Operation, Built-in MUlti-Zone/Schedule Master Clock, Program Distribution to One Room, Selected Rooms, All Rooms or Group of Rooms, Six Programmable Levels of Call Priority, All-call, Individual or Multi-Zone Paging, Remote Diagnostics and Programming Capability, Media REtrieval Capability, Digital Clock and Clock Messaging Support, User Programmable Tone Signals.