Supplementary to Audible Alarms: VADs are particularly effective in high-sounds regions or the place hearing protection is worn, supplementing regular audible alarms. Jobs fall into the following classes: movie; images; art; interior layout and architectural experiments; textile and clothing management; strategic communications and graphic design and style; theatre; and an https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/