A training device for explosive weapons, eg a Claymore mine 10, in which the detonator and explosive are replaced by an adaptor 15 having light emitting means 20, e.g. a photographic flash, connected to it and the adaptor 15 interconnects with the triggering mechanism of the explosive weapon so that triggering of the weapon actuates the light emitting means 20. This has the advantage of providing a dramatic indication of device actuation using the actual weapon without any safety problems and without the use of pyrotechnic devices.