Supplementary to Audible Alarms: VADs are specially helpful in higher-sound regions or where by hearing protection is worn, supplementing standard audible alarms. Dependant on what I’ve seen of Vids so far, it appears to be roughly what you’d get in the event you transformed Google Slides into a movie application. https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/