Supplementary to Audible Alarms: VADs are specifically helpful in large-sounds areas or the place Listening to protection is worn, supplementing classic audible alarms. Set up in Significant-Sounds Regions: Set up visual alarms in locations where noise levels exceed ninety dB(A) or where Listening to security is usually applied. The Workplace https://www.firesense.co.uk/type/addressable-fire-system/addressable-sounders-vids-vads/