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"Microwaves are common. Radios, satellite television, radars, GPS, Bluetooth, cell phones and, of course, microwave ovens employ them, and they're deemed harmless in most applications, though the newspaper points out that governments, including the United States and Russia, have for decades studied ways to weaponize them.
The weapon itself would be portable, according to The New York Times, capable of being held in one's hand or mounted on a vehicle, and while most would work over the span of only a few blocks, high-powered versions could fire microwave beams up to several miles."