The Bosch LBB1956/00 is the PLENA six-zone call station: zone, all-call and PTT keys, condenser microphone on a flexible stem, selectable gain, speech filter and limiter; up to 8 LBB1957/00 keypads. Scroll down for details.

The Bosch LBB1957/00 adds seven zone keys with LEDs to the LBB1956/00 call station; up to eight keypads per station, same metal base, flush-mountable. Scroll down for details.