Here's an interesting new device, Raytheon's Silent Guardian. Writer Michael Hanlon in the Dailymail says "I am told not to call it a ray-gun ..." so he proceeds to call it precisely that as he plays the role of target for a table top model.
The production model is too large for household use and is better on a large group. However it can target a specific individual and has a range of over 250 meters. From the Product Data Sheet (PDF):
The system’s antenna emits a focused beam of millimeter wave energy. The beam travels at the speed of light and penetrates the skin to a depth of 1/64 of an inch, producing an intolerable heating sensation that causes the targeted individuals to instinctively flee or take cover. The sensation ceases immediately when an individual moves out of the beam or the operator steers the beam away. Silent Guardian does not cause injury because of the shallow penetration depth of the millimeter wave.
Ouch!
Via Coolest-Gadgets and Information Week.
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