Supplementary to Audible Alarms: VADs are notably successful in higher-sounds parts or in which hearing security is worn, supplementing classic audible alarms. Plenty of People completed movies, I believe, will seem like recorded PowerPoint presentations or Meet calls or those now-ubiquitous coaching videos where a person talks to you personally https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/