It only bothered the bats. Like the bats, the rats left the scene instantaneously when the Transonic unit was turned on. Although the unit repels rats at a decibel level that humans can hear, Voiles placed the unit far enough away from Embassy buildings so it bothers no one. For 17 years, no one had been able to rid the residences of bats and the compound of rats. All of that has changed since the Transonic units.
Good news travels fast.
He's also very open about the savings and benefits for the U.S. Government. He also points out the reduced health hazard. Bat and rodent droppings contain parasites that can spread rabies, plagues, and other diseases. He pauses to think gratefully about barefoot children who might run freely in Embassy yards. Local hero, indeed.