A general objective electronic sounder for fire, safety and industrial programs; the Sonos Sounder Beacon is Licensed to EN54. It’s very important that these sounders and visual alarm equipment are prominently marked with “FIRE ALARM” for crystal clear identification. This small thing has mighty items likely for it. I utilize https://www.firesense.co.uk/type/conventional-fire-system/conventional-sounders-vids-vads/