Supplementary to Audible Alarms: VADs are specifically productive in superior-noise places or the place Listening to security is worn, supplementing traditional audible alarms. Initiatives tumble into the next categories: online video; pictures; art; inside layout and architectural scientific studies; textile and clothing administration; strategic communications and graphic style; the... https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/