Supplementary to Audible Alarms: VADs are significantly effective in large-sound parts or where hearing safety is worn, supplementing classic audible alarms. A VAD or Visible alarm unit is really a type of crisis inform method that gives a visible cue to people throughout an crisis. Appliances and speakers mechanically synchronize https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/