Flash Reports are preloaded concussions which produce an extremely loud bang with a white flash and puff of smoke. (Must be used in conjunction with a concussion pot)
The dBA readings for Flash Reports are:
You can also find a copy of the independent report on Air Overpressure of Le Maitre Flash Reports (Concussion effects) by Dr Rob Farnfield, the Technical Services Manager at Exchem Explosives. (See PDF file Farnfield Report, in the Documents link on this page).
There may be minimal fallout as all pyrotechnics can produce some remnants of hot and/or cold fallout. Risk assessments must be carried out when using all Le Maitre products and this should involve a test firing of the product.