Sounds like a failed weapons system that they're trying to find another use for. If it had been powerful enough to sweep roads ahead of a convoy and detonate IEDs it might of had a more practical use.
Even back in the '80s, US Special Forces "A" Teams were trained in how to close on and destroy microwave based ground detection systems (like the ones we sold to Iran) without getting fried. I went through that program which uses actual working systems set up on a US installation. I don't see the item depicted here as being useful for much more than civilian crowd control when there is an element of surprise.
OTOH, if it's legal for riot control purposes, shouldn't it be legal for interrogation? Perhaps prolonged exposure to the effects of this device could replace waterboarding!
Kind of makes you go Hmmmm.