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.

The Bosch LBB1935/20 is a PLENA power amplifier that adds loudspeaker power to public address and voice alarm systems. Its priority switching lets important announcements take precedence over background music.

The Bosch LBB1938/30 is an EN 54-16-certified 480 W PLENA power amplifier for public address and voice alarm systems. It supports 70 V, 100 V, and 8 Ω loudspeaker loads, and its dual inputs with priority switching let announcements take precedence over background music.

The Bosch LBB1930/20 is a 120 W PLENA power amplifier for public address and voice alarm systems. It supports 70 V, 100 V and 8 Ω loudspeaker outputs and has two balanced line inputs with priority switching for announcements. Its dedicated 100 V input lets you add amplification to an existing loudspeaker line.

The Bosch LBB1956/00 is a six-zone call station for the PLENA Voice Alarm System. It lets operators make live announcements to selected zones or page all zones at once. Optional LBB1957/00 keypads add selection buttons for more zones or zone groups

The Bosch LBB1957/00 is a PLENA Voice Alarm Keypad that adds seven illuminated zone or zone-group selection keys to the LBB1956/00 Call Station. Connect up to eight keypads per call station for installations that need more paging selections.

Bosch LBB1965/00 Message manager, A high-performance, highly versatile stand-alone digital message player, Up to 12 messages and 12 trigger inputs, Supported sample rates (fs): 24 / 22.05 / 16 / 12 / 11.025 / 8 kHz, 230/115 VAC, ±10%, 50/60 Hz.