I guess my first question would be what you want with them. I should think that pyrotechnics are usually illegal in your area. If you want a signal device for night a strobe light would be preferable IMHO. In daytime a mirror is the most effective. I wouldn't have believed that if I hadn't seen one shine through the canopy in RVN.
The top one looks like what we had but $40 is a little steep IMHO. We had them in RVN but I don't recall ever using one.
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