DECK/WALL-MOUNTING TYPE, 100V HIGH IMPEDACNE TYPE TALKBACK, PAGING, PRIORITY, G.E.A SIGNAL GENERATOR, G.E.A MUTING ANNOUNCING PRIORITY: 12-Class, SYSTEM FAULT DETECTOR MAX.9-SPEAKER GROUP, BUILT-IN 5W MONITOR SPEAKER & DIMMER SW INTERFACE WITH AT, GENERAL ALARM, FIRE ALARM & OTHER SYSTEMS POWER SOURCE: AC220V & DC24V AUTO CHANGEOVER