Right, to me a useful demo has to have several attributes to prove the concept: 1. It has to take place in a real-world setting, perhaps a vacant hotel room or

Right, to me a useful demo has to have several attributes to prove the concept: 1. It has to take place in a real-world setting, perhaps a vacant hotel room or a coffee shop that has closed for the day. 2. It has to be monitored by independent technicians who can verify that the energy transmission is occurring via ultrasound, not some other means. 3. The transmitter has to be plugged into a normal wall socket (to establish a lower bound on efficiency). 4. The receiver needs to show how much electrical power it is producing, and that needs to be at least 3W. 5. The receiver needs to be held by a human, and for part of the demo the human should be walking slowly in a straight line. After all, it's not that the transmission of energy via ultrasound is physically impossible. No one is asserting that (including, hilariously, the professors this "reporter" got to acknowledge is within the laws of physics). The question is whether they have the technology they claim, such that a reasonable person might plausibly hope to refine into a marketable product. To me, a demo showing all of that would prove the key technologies: namely, beamed power transmission via ultrasound to a working receiver, receiver tracking, and at least basic short-term safety for humans. That doesn't mean there's a viable product here, of course; such a device might still be unsafe in many ways, it might be a hazard to animals, it might be far too inefficient to be useful, it might not be able to track more complex motion reliably, it might not work well or at all with multiple receivers, etc., etc., etc. That's the "multiplicative risks" people mention and many of the objections to a marketable product would still apply. But many companies have technically functional products they fail to bring to market or make a profit from, without being fraudulent. Multiplicative risks apply to almost any new product concept. Having a device that, whether marketable or not, clearly has the essential attributes that they claim would at least quiet the charges of fraud.