Supplementary to Audible Alarms: VADs are particularly efficient in large-sound parts or where hearing safety is worn, supplementing standard audible alarms. A VAD or Visible alarm unit is really a style of crisis warn procedure that gives a visual cue to people in the course of an emergency. This computerized https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/