The flash charges of VADs are between 0.5 Hz and a pair of Hz. VADs could include things like a synchronisation functionality to eradicate the potential of a flash frequency that could cause adverse results, such as inducing epileptic matches, when equipment are in close proximity. Put basically, this steerage https://www.firesense.co.uk/type/conventional-fire-system/conventional-sounders-vids-vads/