The flash premiums of VADs are among 0.five Hz and a pair of Hz. VADs may include things like a synchronisation function to remove the possibility of a flash frequency that can bring about adverse results, for instance inducing epileptic fits, when gadgets are in near proximity. Installation in High-Sounds https://www.firesense.co.uk/type/conventional-fire-system/conventional-sounders-vids-vads/