I personally would be very skeptical of something called a "UFO Detector" just as I would be skeptical of something called a "Sasquatch Detector", or any other " (insert paranormal phenomenon here) Detector". I don't know much about the device itself so I can't speak authoritively. I will say however, that from my experience, UFO's are a very random phenomenon - you never know where or when your going to encounter one. What principals can one use which will detect a UFO conclusively, and not be decoyed by a hundred other things like strong electromagnetic currents, ect. ?