The Bosch LBB1990/00 is the main controller for the PLENA Voice Alarm System. It routes live announcements and prerecorded evacuation messages to selected loudspeaker zones and monitors the loudspeaker lines for faults.

The Bosch LBB1992/00 is an EN 54-16-certified PLENA Voice Alarm Router that adds six loudspeaker zones to the LBB1990/00 Voice Alarm Controller. It provides 12 trigger inputs for emergency and routine announcements, plus six volume override outputs.