This will be the first time you see damage done to two coke cans that were shot with infrasound and ultrasound from an industrial strength signal generator that can spread it's wings for up to 5 square kilomet. I have measured the strength at 164 decibel for each, but they tell me it can go up to 210dB. They can shoot a test signal at 210 dB using a sine wave, square wave or what they choose. Do full screen and see what it can do to you or your chldren. Notice the sharp symetrical edges.