History/Background: The Impact Flash Bang Device which creates 175dB, 4psi of over pressure and 500K CP. Other options: a blitz assault with flash bangs, which cause that. A heavily armed narcotics SWAT team swooped down on a closed-off street in Luton. History/Background: The Impact Flash Bang Training Device which creates 175dB. Neighbors are on edge due to a pawn shop where one man tried to sell what was originally thought to be two hand.