A general purpose electronic sounder for fire, safety and industrial programs; the Sonos Sounder Beacon is Licensed to EN54. Fire Alarm Bells We provide a range of hearth alarm bells designed for use on hearth alarm systems in common 24v versions and 230v driven variations for different purposes. Style and https://www.firesense.co.uk/type/conventional-fire-system/conventional-sounders-vids-vads/