Mice Repellers - We'll Let You Decide
'The E.P.A. has never found any credible evidence to support claims that electronic, electromagnetic or ultrasonic repellent devices work,' Mr. Walker said. The agency spent $250,000 on tests and found that animals and insects acclimated quickly to the devices or ignored them.
George D. Cardoza, the executive vice president of Griggs Browne Company, a large pest-control company based in Providence, R.I., can rattle off one success story after another about the repeller, but they involve factories and dumpsters. 'My opinion is that ultrasonics are a complete waste of time for homeowners,' he said. 'You would need a unit for every room in the house and even then furniture would stop the sound.'