This video compares the IWA International Thunder Flash, Mark V, Mark 7, and Mark 9 noise distraction devices. The Thunder Flash is noted as less potent than the larger models and not recommended for detonation out of water. The Mark 9, designed as a diver signaling device, is exceptionally loud, even underwater. The speaker emphasizes the significant noise difference between the devices, suggesting the larger ones are at least twice as loud as the smaller Thunder Flash.
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