A general goal Digital sounder for fireplace, protection and industrial purposes; the Sonos Sounder Beacon is certified to EN54. Installation in Higher-Noise Locations: Put in Visible alarms in parts where noise ranges exceed ninety dB(A) or where by hearing security is often used. Listening to Enhancement Program Necessity: This document https://www.firesense.co.uk/type/conventional-fire-system/conventional-sounders-vids-vads/