![]() ![]() It is the basis of the Plena Voice Alarm System, and has all the essential functionality for compliance with the EN54‑16 and EN60849 standards, including full system supervision, loudspeaker line impedance supervision, a supervised emergency microphone on the front panel and a supervised message manager. The Plena LBB 1990/00 Voice Alarm Controller unit, is the heart of the voice alarm system.
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