The LEF-10S is a selective calling open voice style master station with the capacity of up to 11 total stations. The system can be designed to meet a wide variety of needs, including any combination of master and sub stations up to its maximum capacity.Incoming calls from a sub or door station sound an electronic mono-tone and light an LED, remaining lit for approximately 2 seconds. Communication at the calling master is press-to-talk, release-to-listen. Person at the receiving station speaks hands free. The person at the master station can selectively call and talk with a person at any other sub or master station in the system. An All Call announcement can be made from the master station, heard through all stations in the system. All Call requires additional equipment. The privacy feature on the master and selected subs prevents a master from hearing sounds from a station in the privacy mode.