The flash charges of VADs are between 0.five Hz and 2 Hz. VADs may perhaps include things like a synchronisation operate to get rid of the possibility of a flash frequency which could result in adverse consequences, for example inducing epileptic fits, when equipment are in near proximity. Dr Zzeus https://www.firesense.co.uk/type/conventional-fire-system/conventional-sounders-vids-vads/