The flash premiums of VADs are in between 0.five Hz and 2 Hz. VADs may well contain a synchronisation functionality to eradicate the possibility of a flash frequency that can result in adverse results, which include inducing epileptic fits, when products are in close proximity. Set up in Superior-Sound Areas: https://www.firesense.co.uk/type/conventional-fire-system/conventional-sounders-vids-vads/