Visual Alarms: Use light-weight to signal emergencies, Particularly effective in noisy configurations and for anyone with Listening to impairments. To be able to prevent discrimination, BS EN 54-23 compliant VADs can be installed in all sanitary accommodation (not only WCs) and all lodge bedrooms, pupil accommodation and very similar properties, https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/