Invaluable little tool its basically 25 high power camera flashers in series light enough to mount on trees. shields.and perimiters ive done a test at 100 feet and i was wearing sunglasses no joke all i see for 5 mins is white bloch couldnt focus followed by a killer headache no joke be causous testing these as im sure at close range would do severe damage to vision but in the right senario if your blind and cant see how do you fight aim ect invaluable piece of gear in my opinion