Supplementary to Audible Alarms: VADs are notably successful in high-sounds places or in which hearing security is worn, supplementing regular audible alarms. Set up in High-Noise Parts: Put in visual alarms in areas the place sounds levels exceed ninety dB(A) or where Listening to security is usually made use of. https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/