This is not a cannon. I used the instructions on the Kemo website to build the cannon. I have experience with electronic components and took the time to put this thing together. I used a 1 5/8 ID pipe, 30cm long with a plug on the back end. A piezoelectric element was built into the tube. I checked all the connections with my meters, everything works. Tested at close range <5 meters and animals didn't like it. But it is advertised as 300 meters. So we tried the neighbor's dogs, maybe 50 meters away and didn't even phase them. I wouldn't recommend it for "weapon" but can be used as a deterrent for close combat.
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