A typical goal Digital sounder for fireplace, security and industrial apps; the Sonos Sounder Beacon is certified to EN54. EN54-23 is a ecu Common for visual alarm units, which aims to make certain their mild output is measured uniformly across Europe. This standard is pretty new, pushed partly with the https://www.firesense.co.uk/type/conventional-fire-system/conventional-sounders-vids-vads/