Supplementary to Audible Alarms: VADs are notably effective in substantial-sounds locations or wherever Listening to security is worn, supplementing traditional audible alarms. A VAD or Visible alarm product is usually a type of emergency inform technique that gives a visible cue to persons during an emergency. Click "Drop" to reject, https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/