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The Mark 9 Thunderlash device is designed for training and battle re-enactment scenarios. They have a fully biodegradable military specification cardboard construction and can be used indoors and outdoors. They are a proven cost-effective training enhancement producing 185 dB of sound pressure at 1m with a 750,000 candle light output. The Mark 9 electric ignition Thunderflash features a 0.5mm thick command wire and initiated with an electrical match head with no time delay, for instantaneous bright flash with noise.