The main power that these weapons have is that, while the victims are being attacked they are totally unaware of the fact that they are under serious threat from an outside source, and therefore have no means whatsoever of self defence.
The weapons are known within the "trade" as non-lethal weapons or silent weapons. These weapons are not new, they have been operational and used in warfare and on innocent members of society for over 50 years. The Russian military were the original leaders in "Psy-Ops Warfare", as it is now called, during the fifties, designing the technology to a very high standard.