Supplementary to Audible Alarms: VADs are particularly helpful in superior-sounds regions or in which hearing security is worn, supplementing regular audible alarms. A VAD or Visible alarm machine can be a variety of unexpected emergency alert technique that gives a visible cue to people through an unexpected emergency. Effortless configuration https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/