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The Jablotron JA-111A BUS external siren base is designed for sound alarms, tones and PG output activation and deactivation. The siren communicates and is powered by the control panel BUS. In the event of a power failure, the implemented energy-saving function will be used. The siren also has a built-in spirit level so that adjustments can easily be made during installation. It is possible to assign it a zone and it occupies only one position in the alarm system.