LBB 156/00 call station is a high-quality call station, fashionable and elegant, with stable metal base design, flexible microphone handle and single-directional capacitor microphone. It is used to call selected areas (zones 1 to 6 and all-body calls) in a public broadcast system built using the Plena voice alarm system. Call station design is novel, not only support desktop installation, but also can be flat embedded in the table. LBB 1957/00 Plena voice alarm system keyboard can add 7 additional keys. Basic function supports 6 zone selection per call station. Users can increase the number of regions or groups available by connecting to the call station keyboard (LBB 1957/00). You can add up to eight keyboards, each with seven zone or zone group keys. The call station is equipped with an optional gain control, an optional voice filter, and a limiter to improve speech clarity. The call station provides balanced line level output, enabling it to be installed up to 1000 metres away from the controller via CAT‑5 extension cables. By using shielded cable, the call station can also be used in EMC level 5 (heavy industry) environments. The DIP switch at the bottom of the call station allows you to select different microphone gain levels, call station ids, and voice filters. The service access knob controls the flat attenuation of the telephone. The LED indicator on the call station is used to display the selected area. The other three LED indicators are used to display the activated state of the microphone and system. Green flicker indicates standby. Green means the microphone is activated. The amber color indicates that the system has detected a fault, while the red color indicates that the system is in an emergency. Controller and the indicator lights, four LED lights, PTT button, PTT state LED lights, six regions select key, six regional choice of LED lights, all the call button, eight DIP switches, the volume knob interconnection, two RJ45 socket, 24 VDC input, the keyboard connector certificates with immunity recognition security in accordance with EN 60065 standard EN 55103-2 standard radiation in accordance with EN 55103-1 standard