Notably powerful with the Deaf or hard of Listening to, particularly in eventualities the place visual alarms may possibly go unnoticed. Universal Recognition: VADs are designed to offer a common warning sign that is well recognizable by Everybody, in spite of their volume of hearing or cognitive capacity. Visible Alarms: https://www.firesense.co.uk/type/conventional-fire-system/conventional-sounders-vids-vads/