Supplementary to Audible Alarms: VADs are especially powerful in significant-sounds locations or in which Listening to defense is worn, supplementing common audible alarms. Installation in High-Sound Locations: Put in visual alarms in areas wherever noise amounts exceed 90 dB(A) or where Listening to safety is commonly used. Simply click "Decrease" https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/