The flash premiums of VADs are among 0.5 Hz and a couple of Hz. VADs may possibly contain a synchronisation function to reduce the potential for a flash frequency that might result in adverse consequences, including inducing epileptic fits, when products are in close proximity. EN54-23 is a ecu Regular https://www.firesense.co.uk/type/conventional-fire-system/conventional-sounders-vids-vads/