BESS | commercial | destructors | pyronex | simulators | smoke generators | thunderflash Thunderflash Thunderflashes are used to simulate battle noises. On ignition the item produces a flash and a medium intensity "BANG". Sound level can be adjusted to customer requirements. The diver recall thunderflash is ballasted to function at a depth of approximately six metres of water.This product has been carefully designed to offer maximum protection to the user. Thunderflash Non-Electric CS4001 MK1 Sharp Loud Bang Firing delay 4-6 seconds Thunderflash CS4002 Sharp Loud Bang Firing delay 6 seconds Thunderflash Diver Recall CS4003 Sharp Loud Bang Firing delay 6-8 seconds