What's the motive ?
Here's the source: https://www.dailymail.co.uk/sciencete...#ixzz2ugY4rx96
You simply have to try Fujitsu's ultrasonic tablet to know what the fuss is about.
Here's a video (not me, but from the other source): https://distilleryvesper9-13.ak.insta...8d5a61_101.mp4