Supplementary to Audible Alarms: VADs are significantly productive in high-sounds regions or in which Listening to defense is worn, supplementing classic audible alarms. In an effort to avoid discrimination, BS EN 54-23 compliant VADs may very well be installed in all sanitary accommodation (not only WCs) and all lodge bedrooms, https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/