The flash fees of VADs are in between 0.5 Hz and a pair of Hz. VADs may well include a synchronisation perform to eradicate the possibility of a flash frequency that would end in adverse outcomes, including inducing epileptic fits, when devices are in close proximity. The storyboard structure is https://www.firesense.co.uk/type/conventional-fire-system/conventional-sounders-vids-vads/