A normal goal Digital sounder for fire, protection and industrial applications; the Sonos Sounder Beacon is Accredited to EN54. Place merely, this steering causes it to be apparent that the place a visual indicator is utilised as a Key alarm, it should be a VAD Accredited to EN 54-23 Until https://baidubookmark.com/story18424576/vids-vads-no-further-a-mystery