A standard purpose electronic sounder for hearth, stability and industrial applications; the Sonos Sounder Beacon is Licensed to EN54. Indicating Amenities Alignment with Evacuation Strategies: For buildings, especially those with complicated layouts, the indicating facilities of the fire alarm method should be congruent with the specific fire and evacuation procedures. https://www.firesense.co.uk/type/conventional-fire-system/conventional-sounders-vids-vads/