Looking forward to a riveting study by the South Korean Ministry of Science on the phenomenon of fan death.
Sorry, that was perhaps too snarky. But this is still very silly.
In addition, the device developed by the research team produced almost no heat due to its high energy conversion efficiency .
I'm sure that's of great comfort when your cells are being disrupted by a sonic horn of the type shown in the pictures. It's trivial to calculate the ultrasound dose required for the reported 4% energy transmission for a typical implanted device, but note that no such calculation is reported in the press release.