The Bosch LBB1990/00 is the heart of the PLENA Voice Alarm System: six zones on board, up to 120 zones with routers, a built-in 240 W amplifier and message manager, supervised emergency microphone, EN 54-16 certified. Scroll down for details.

The Bosch LBB1992/00 adds six zones and 12 input contacts to the PLENA Voice Alarm System, with one or two amplifiers for calls and background music at the same time. EN 54-16 certified. Scroll down for details.