A common objective electronic sounder for fireplace, safety and industrial applications; the Sonos Sounder Beacon is Qualified to EN54. Put simply, this guidance makes it distinct that where a visual indicator is utilized as being a Major alarm, it should be a VAD Qualified to EN fifty four-23 Except the https://www.firesense.co.uk/type/conventional-fire-system/conventional-sounders-vids-vads/