Visible Alarms: Employ light-weight to sign emergencies, Specially efficient in noisy settings and for the people with hearing impairments. A VAD or Visual alarm device is often a kind of crisis alert program that gives a visible cue to individuals through an emergency. Wherever a specification calls for Visible gadgets, https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/