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The LBB 1957/00 call station keyboard is an extension component of the LBB 1956/00 Plena voice alarm system call station, adding 7 additional area selection keys. It has the same stable metal base as the call station. Call station design is novel, not only support desktop installation, but also can be flat embedded in the table. Basic function supports 6 zone selection per call station. After connecting to any of these keyboards, you can add seven regions or groups of regions (optional). Each LBB 1956/00 call station can add up to 8 keyboards. The LED on the keyboard indicates the area where the light can indicate movement. Controller and the indicating lamp, the seven areas to select key, seven areas to choose the LED indicator light, eight DIP switch interconnection, two RJ45 socket, 24 VDC input, the keyboard connector and recognized safety certificate conform to the EN 60065 standard radiation immunity in accordance with EN 55103-2 standard EN 55103-1 standard area certification European CE conformity declaration attachments quantity component 1 LBB 1957/00 calling station keyboard Technical specifications of electrical power supply voltage range LBB 1956/00 provide 24 VDC current consumption < 15 mA mechanical base size 40 x 100 x 235 mm (1.57 x 1.57 x 3.97 inches) weight about 1 kg Mounting bracket, with other LBB LBB 1956/00 or 1956/00 used carbon black and silver color