That's a great question. Actually, that was one of the reasons the original technology did not work that well. When we actually went into the lab to determine the level we needed for incapacitation.... The discharge of our pulse is really in the range of microseconds. The actual pulse lasts for about a microsecond. When you look at that, again, that release causes a single muscle contraction.
What we learned in the lab and what we actually even learned in our human testing early on is that if we used anything less than about 12 to 14 pulses per second, the individual was able to have enough recovery time of their muscle to be able to function, while being jerked around, but once we crossed that threshold we got the true incapacitation, in which the muscle would lock up to the point where they were not able to continue to incapacitate.
We came up with the 19 pulses per second because that was what was required in order to get incapacitation. If we went much beyond that, we didn't see any further lock-up. That was the optimal point where we got the lock-up of the individual. They couldn't fight through it. But going beyond that, there was no further benefit.