My primary issue with the zappers is that in her original book she stated any frequency above 32,000hz. Well any frequency above that includes microwaves and gamma rays. And even below that there are frequencies that are beneficial and some are still dangerous. For example I have found that the frequency of 666hz on the Rife units works on everything we have tried it on. But the bogus 11 page frequency lists being passed around with many of the Rife machines lists 42hz for cancer and other diseases. The problem is that this is the frequency of formaldehyde, one of the strongest carcinogens known. So nobody should ever claim "any frequency".