Supplementary to Audible Alarms: VADs are significantly helpful in significant-sounds spots or where by Listening to security is worn, supplementing common audible alarms. A VAD or Visible alarm unit is really a variety of unexpected emergency alert process that provides a visible cue to people all through an unexpected emergency. https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/