The flash costs of VADs are among 0.5 Hz and 2 Hz. VADs might contain a synchronisation perform to eradicate the potential of a flash frequency that might result in adverse consequences, for example inducing epileptic fits, when equipment are in near proximity. Dr Zzeus Q&A: If fireplace alarm indicator https://www.firesense.co.uk/type/conventional-fire-system/conventional-sounders-vids-vads/